An earlier post in this series discussed considerations for reporting and interpreting cross-site impact variation and for designing studies to investigate such cross-site variation. This post discusses how those ideas were applied to address two broad questions in the Mother and Infant Home Visiting Program Evaluation.
Part I of this two-part post discussed MDRC’s work with practitioners to construct valid and reliable measures of implementation fidelity to an early childhood curriculum. Part II examines how those data can reveal associations between levels of fidelity and gains in children’s academic skills.
Lessons from the Grameen America Evaluation
In any study, there is a tension between research and program needs. This program’s group-based microloan model presented particular challenges for random assignment. Reflections in Methodology looks at how the research design was adapted to allow a fair test of the program’s effectiveness without hampering its ability to operate.
As an alternative to random assignment, a regression discontinuity design takes advantage of situations where program eligibility is determined by whether a score exceeds a threshold. With careful attention to assumptions, analysis, and interpretation, this quasi-experimental design can provide rigorous estimates of program effects. Reflections on Methodology outlines some considerations.
Schools use individual screening tests to identify students at risk of falling behind in their reading levels. Could predictive analytics, incorporating multiple composite and subsection scores from a series of tests over time, do a better job of identifying at-risk students? Reflections on Methodology gives an example of this approach.
Lessons from the Grameen America Formative Evaluation
Random assignment is prized for its rigor, but it’s not always feasible to carry out. This Reflections in Methodology post outlines other strong options for studying the effects of a program and illustrates the application of some key considerations in a specific context.
This paper provides a detailed discussion of the theory and practice of modern regression discontinuity. It describes how regression discontinuity analysis can provide valid and reliable estimates of general causal effects and of the specific effects of a particular treatment on outcomes for particular persons or groups.
This paper provides practical guidance for researchers who are designing studies that randomize groups to measure the impacts of educational interventions.
No universal guideline exists for judging the practical importance of a standardized effect size, a measure of the magnitude of an intervention’s effects. This working paper argues that effect sizes should be interpreted using empirical benchmarks — and presents three types in the context of education research.