Publication Date
| In 2025 | 0 |
| Since 2024 | 0 |
| Since 2021 (last 5 years) | 0 |
| Since 2016 (last 10 years) | 2 |
| Since 2006 (last 20 years) | 4 |
Descriptor
| Control Groups | 4 |
| Experimental Groups | 4 |
| Randomized Controlled Trials | 4 |
| Attrition (Research Studies) | 3 |
| Educational Research | 3 |
| Correlation | 2 |
| Models | 2 |
| Responses | 2 |
| Statistical Bias | 2 |
| Attendance | 1 |
| Bias | 1 |
| More ▼ | |
Source
| What Works Clearinghouse | 4 |
Author
Publication Type
| Reports - Descriptive | 3 |
| Reports - Evaluative | 1 |
Education Level
| Elementary Education | 1 |
| Grade 11 | 1 |
| Grade 7 | 1 |
| Grade 9 | 1 |
| High Schools | 1 |
| Junior High Schools | 1 |
| Middle Schools | 1 |
| Secondary Education | 1 |
Audience
Location
| Florida | 1 |
Laws, Policies, & Programs
Assessments and Surveys
What Works Clearinghouse Rating
Peer reviewed
Download full textWhat Works Clearinghouse, 2017
"Attrition" is the loss of sample during the course of a study. It occurs when individuals initially randomly assigned in a study are not included when researchers examine the outcome of interest. Attrition is a common issue in education research, and it occurs for many reasons. The What Works Clearinghouse (WWC) is an initiative of the…
Descriptors: Attrition (Research Studies), Control Groups, Experimental Groups, Randomized Controlled Trials
What Works Clearinghouse, 2019
Large numbers of qualified students do not apply to and enroll in college. Yet, earning a college degree is one of the primary pathways for economic success and is increasingly required for good jobs and high wages. A number of programs and practices aim to improve college readiness and enrollment, including "Take Stock in Children's®…
Descriptors: Educational Improvement, Graduation, Higher Education, Middle School Students
What Works Clearinghouse, 2014
Attrition occurs when members of the initial research sample are not part of the final analysis sample, such as due to missing data or leaving the study. Both the overall sample attrition and the differences in attrition between the groups can affect the statistical equivalence of the sample and create potential for bias. The WWC has given careful…
Descriptors: Attrition (Research Studies), Statistical Bias, Randomized Controlled Trials, Models
What Works Clearinghouse, 2013
Attrition occurs when members of the initial research sample are not part of the final analysis sample, such as due to missing data or leaving the study. Both the overall sample attrition and the differences in attrition between the groups can affect the statistical equivalence of the sample and create potential for bias. The WWC has given careful…
Descriptors: Attrition (Research Studies), Statistical Bias, Randomized Controlled Trials, Models
