Quasi-experimentation A Guide To Design And Analysis Pdf -

Hartley frowned. "So I should flip a coin? Randomly assign kids to software or no software?"

This is the domain of . For decades, researchers across education, economics, public health, political science, and psychology have relied on quasi-experimental designs (QEDs) to draw causal inferences without full randomization.

Hartley agreed. They dug up the data.

A quasi-experimental design is only as good as its ability to systematically rule out these threats. The guide provides specific designs to address each.

As Lena analyzed, she spotted classic quasi-experimental pitfalls:

"Lena, look," Hartley said, tapping his desk. "I installed it in Ms. Chen’s third-grade class. She’s our best teacher. The other third-grade class, Mr. Abel’s, is using the old curriculum. After three months, I’ll compare their test scores. Simple, right?"

Quasi-experiments live or die on measured covariates. Gather as many pre-treatment variables as possible (demographics, prior outcomes).