Original collectionUnder development

Under development — library extension. This report is part of the expanded-library work, not the original collection. Source preparation, methods and results are subject to revision.

Provisional eligibility assessment — under development. Deep DiD follow-up: Appendix Figure 3 has authored opening dates and campus/term effects, separate from course-taking IV. Existing campuses are coded open_term=100, the same numeric event category as treated opening term; a conventional never-treated sentinel would not reproduce the exact design matrix. Resolve that normalization and pre-opening support. The supplied ZIP has code/readme, no analysis microdata. This working assessment is not fully vetted and may change. See the report below for its recorded replication or assessment status. Provisional eligibility log

Virtual Classrooms: How Online College Courses Affect Student Success

Eric P. Bettinger; Lindsay Fox; Susanna Loeb; Eric S. Taylor (2017). American Economic Review.

Under development — community extension. This is a provisional source-design assessment, not a new successful replication or a final eligibility ruling.

Extension index · Provisional eligibility log · Assessment JSON · QMD · Reproduction code

Source design and template applicability

Online enrollment is instrumented by offer-by-distance-to-campus. Binary online enrollment does not make the identifying IV design observational DiD; the student analysis inputs are also restricted.

No DiD estimates, uncertainty intervals or homogeneity-test decision were computed in this tranche. No point is added to the calibration plots. This is not a zero effect or a failed statistical test.

Recorded treatment-column measurement

Data unavailable.

The student-level online-course analysis data are restricted and absent from the deposit.

These are the existing data-measured counts, not counts inferred from design labels. A binary instrument, group indicator or interaction component need not be the treatment of interest; the source-design assessment above takes precedence for template applicability.

Replication status

This tranche: unsupported design; source code/documentation inspected, no estimator run.

Supplied library: no_did_analysis_data; verification: no scalar DiD target; preparation: needs_restricted_data. These are the library’s labels, not new verification claims. Missing data and unsupported designs are separate issues.

Evidence and provenance

The following files in the supplied library were inspected. Their SHA-256 digests are recorded in the downloadable assessment JSON. Source archives and microdata are not redistributed.

• AER/Bettinger_Fox_Loeb_Taylor_AER_2017_113090/R/555_bettinger_fox_loeb_taylor_figure.R (106 lines)
• AER/Bettinger_Fox_Loeb_Taylor_AER_2017_113090/R/555_bettinger_fox_loeb_taylor_replicate.R (238 lines)
• AER/Bettinger_Fox_Loeb_Taylor_AER_2017_113090/verdict.md (113 lines)
• AER/Bettinger_Fox_Loeb_Taylor_AER_2017_113090/aeraej-555.md (103 lines)