{"id":2021,"date":"2025-01-23T12:50:43","date_gmt":"2025-01-23T11:50:43","guid":{"rendered":"https:\/\/guillaume-guerard.com\/?page_id=2021"},"modified":"2025-01-23T13:00:58","modified_gmt":"2025-01-23T12:00:58","slug":"recherche-longitudinale","status":"publish","type":"page","link":"https:\/\/guillaume-guerard.com\/en\/cours-de-methodologie\/recherche-longitudinale\/","title":{"rendered":"Longitudinal research"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"2021\" class=\"elementor elementor-2021\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-32058e7 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"32058e7\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-f8316e3\" data-id=\"f8316e3\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fd23302 elementor-align-justify elementor-widget elementor-widget-button\" data-id=\"fd23302\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/guillaume-guerard.com\/en\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Welcome<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-5302436\" data-id=\"5302436\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-111b1cb elementor-align-justify elementor-widget elementor-widget-button\" data-id=\"111b1cb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/complex-systems-ai.com\/\" target=\"_blank\" rel=\"noopener\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Data Science<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-2a70935 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2a70935\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-acfc642\" data-id=\"acfc642\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-07acce6 elementor-widget elementor-widget-heading\" data-id=\"07acce6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Page contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Contents\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/guillaume-guerard.com\/en\/cours-de-methodologie\/recherche-longitudinale\/#Plan_scientifique_la_recherche_longitudinale\" >Scientific plan: longitudinal research<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/guillaume-guerard.com\/en\/cours-de-methodologie\/recherche-longitudinale\/#Methodes_et_methodologies\" >Methods and methodologies<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/guillaume-guerard.com\/en\/cours-de-methodologie\/recherche-longitudinale\/#Bonnes_pratiques\" >Good practices<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/guillaume-guerard.com\/en\/cours-de-methodologie\/recherche-longitudinale\/#Ce_quil_faut_eviter\" >What to avoid<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/guillaume-guerard.com\/en\/cours-de-methodologie\/recherche-longitudinale\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"Plan_scientifique_la_recherche_longitudinale\"><\/span>Scientific plan: longitudinal research<span class=\"ez-toc-section-end\"><\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3b7474f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3b7474f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6aeb302\" data-id=\"6aeb302\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c8c02c3 elementor-widget elementor-widget-text-editor\" data-id=\"c8c02c3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Longitudinal research design is used to study changes, developments, or trends over time by observing the same subjects at multiple intervals. Its goal is to analyze how variables change, providing information about causal relationships and long-term trends. For example, a study might track students&#039; academic progress over several years to assess the impact of early childhood education programs. This design is particularly useful for understanding temporal dynamics and the progression of <a href=\"https:\/\/guillaume-guerard.com\/en\/cours-de-methodologie\/parfaire-la-section-resultats\/\">results<\/a>.<\/p><p><img decoding=\"async\" class=\"alignnone wp-image-49 size-full\" src=\"http:\/\/guillaume-guerard.com\/wp-content\/uploads\/2023\/07\/logo_sc.png\" alt=\"recherche longitudinale\" width=\"238\" height=\"203\" \/><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a075a8b elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a075a8b\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-5aa50cd\" data-id=\"5aa50cd\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4e0efaa elementor-widget elementor-widget-heading\" data-id=\"4e0efaa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"Methodes_et_methodologies\"><\/span>Methods and methodologies<span class=\"ez-toc-section-end\"><\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-1e67a71 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"1e67a71\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-8895989\" data-id=\"8895989\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e25d498 elementor-widget elementor-widget-text-editor\" data-id=\"e25d498\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Repeated measures \u2013<\/strong> Repeated measures involve collecting data from the same subjects at different points in time. This <a href=\"https:\/\/guillaume-guerard.com\/en\/cours-de-methodologie\/parfaire-la-methodologie\/\">method<\/a> is effective for examining changes within a subject, such as monitoring blood pressure levels in patients before and after a specific treatment.<\/p><p><strong><a href=\"https:\/\/guillaume-guerard.com\/en\/cours-de-methodologie\/\">Methodology<\/a>\u00a0:<\/strong><\/p><p>Researchers establish baseline measurements and collect follow-up data at regular intervals. The repeated measures approach reduces variability by using participants as their own control. Statistical tools such as repeated measures ANOVA or mixed effects models are used to analyze changes over time. This methodology is particularly useful for clinical trials and behavioral studies.<\/p><p><strong>Cohort studies<\/strong> \u2013 Cohort studies follow a group of individuals who share a common characteristic (for example, birth year, occupation, or exposure) over time to observe how certain exposures or experiences influence outcomes. For example, a cohort study might track the effects of dietary habits on cardiovascular health over decades.<\/p><p><strong>Methodology:<\/strong><\/p><p>Cohorts are identified and data are collected periodically through surveys, interviews or medical records. These studies may be:<\/p><p>Prospective: following individuals into the future to observe results.<\/p><p>Retrospectives: Using historical data to analyze past exposures and results.<\/p><p>Statistical methods such as survival analysis or regression models help to identify trends, risks and correlations within the cohort. This approach is widely used in public health and epidemiology.<\/p><p><strong>Panel studies<\/strong> \u2013 Panel studies involve collecting data from the same group of participants (a panel) repeatedly over time, often to analyze opinions, behaviors, or socioeconomic factors. For example, a panel study might explore how household income influences consumption habits over several years.<\/p><p><strong>Methodology:<\/strong><\/p><p>Researchers maintain a consistent sample of participants and collect data at regular intervals using surveys or interviews. Attrition (participant dropout) is managed through strategies such as follow-ups, incentives, and robust retention plans. Analytical techniques such as fixed-effects models or growth curve modeling are applied to interpret longitudinal data. Panel studies are commonly used in social sciences and market research.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4681bf4 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4681bf4\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-a5fe988\" data-id=\"a5fe988\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-dccee0d elementor-widget elementor-widget-heading\" data-id=\"dccee0d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"Bonnes_pratiques\"><\/span>Good practices<span class=\"ez-toc-section-end\"><\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-86f0ad2 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"86f0ad2\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-e2d8d15\" data-id=\"e2d8d15\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-07fb17d elementor-widget elementor-widget-text-editor\" data-id=\"07fb17d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Rigorous selection of participants:<\/strong><br \/>Select participants who are likely to remain engaged throughout the study to minimize attrition and ensure representativeness.<\/p><p><strong>Consistent data collection:<\/strong><br \/>Use standardized tools and protocols at all times to ensure data comparability and reduce measurement error.<\/p><p><strong>Long term planning:<\/strong><br \/>Develop a detailed plan for follow-ups, including predefined intervals for data collection, to align with study objectives and ensure continuity.<\/p><p><strong>Ethical transparency:<\/strong><br \/>Provide participants with complete information about the purpose, duration, and procedures of the study. Ensure ongoing informed consent and protect participant confidentiality.<\/p><p><strong>Full data analysis:<\/strong><br \/>Use advanced statistical methods to account for missing data and identify trends over time, ensuring accurate and meaningful interpretations.<\/p><p><strong>Manage attrition:<\/strong><br \/>Implement strategies to retain participants, such as regular communications, reminders, incentives, and flexible data collection methods.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a4e921a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a4e921a\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-727d554\" data-id=\"727d554\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-dc686fa elementor-widget elementor-widget-heading\" data-id=\"dc686fa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"Ce_quil_faut_eviter\"><\/span>What to avoid<span class=\"ez-toc-section-end\"><\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-745890f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"745890f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-323d9f2\" data-id=\"323d9f2\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e402f23 elementor-widget elementor-widget-text-editor\" data-id=\"e402f23\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>High attrition rates:<\/strong><br \/>Loss of participants over time may compromise the validity of the results and introduce attrition bias if dropouts differ systematically from those who remain.<\/p><p><strong>Inconsistent methods:<\/strong><br \/>Changing measurement tools or protocols over time can distort trends and reduce data comparability.<\/p><p><strong>Neglecting external influences:<\/strong><br \/>Failure to account for societal changes, policy changes, or environmental factors can obscure true trends and reduce the validity of the results.<\/p><p><strong>Insufficient time points:<\/strong><br \/>Collecting data at too short intervals may fail to capture significant trends or key developments over time.<\/p><p><strong>Ethical oversights:<\/strong><br \/>Ignoring participants&#039; right to withdraw or failing to maintain confidentiality over extended periods of time may undermine credibility and violate ethical standards.<\/p><p><strong>Overgeneralization:<\/strong><br \/>Results from longitudinal studies do not always apply to broader populations or contexts, particularly if the sample is not representative.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-57ee1e0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"57ee1e0\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6422d30\" data-id=\"6422d30\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-657aabc elementor-widget elementor-widget-heading\" data-id=\"657aabc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6acdc22 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6acdc22\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-013218e\" data-id=\"013218e\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3b21dba elementor-widget elementor-widget-text-editor\" data-id=\"3b21dba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Longitudinal research design is a powerful and versatile method for studying changes, trends, and developmental trajectories over time. By using repeated measures, cohort studies, and panel studies, researchers can uncover patterns and relationships that are not evident in cross-sectional designs. Adherence to best practices and careful management of challenges such as attrition and external influences ensure the reliability, validity, and ethical integrity of longitudinal research findings. This design serves as a cornerstone for evidence-based policy, practice, and theoretical advances in diverse fields.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Home Data Science Scientific Plan: Longitudinal Research Longitudinal research design is used to study changes, \u2026 <\/p>","protected":false},"author":1,"featured_media":0,"parent":47,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"footnotes":""},"class_list":["post-2021","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/guillaume-guerard.com\/en\/wp-json\/wp\/v2\/pages\/2021","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/guillaume-guerard.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/guillaume-guerard.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/guillaume-guerard.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/guillaume-guerard.com\/en\/wp-json\/wp\/v2\/comments?post=2021"}],"version-history":[{"count":7,"href":"https:\/\/guillaume-guerard.com\/en\/wp-json\/wp\/v2\/pages\/2021\/revisions"}],"predecessor-version":[{"id":2032,"href":"https:\/\/guillaume-guerard.com\/en\/wp-json\/wp\/v2\/pages\/2021\/revisions\/2032"}],"up":[{"embeddable":true,"href":"https:\/\/guillaume-guerard.com\/en\/wp-json\/wp\/v2\/pages\/47"}],"wp:attachment":[{"href":"https:\/\/guillaume-guerard.com\/en\/wp-json\/wp\/v2\/media?parent=2021"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}