Problem Set 2: Weak Instruments
PP5001 · Martinmas 2026
Due: Friday 30 October 2026, 12 noon (UK time), in Week 7.
Submit your completed Quarto source (.qmd) and rendered PDF through Moodle. Use your student ID in the document. Render the whole document before submitting.
Use the Angrist–Krueger data to calculate the Wald estimate from sample means and reproduce it using IV. Then use three quarter-of-birth instruments, vary the age controls, and report the first-stage evidence alongside the estimated returns to schooling. In the final part, use Claude to help replicate AK Table V, columns (6) and (8), check its code, and assess the results.
Download the Problem Set 2 Quarto notebook
Download the Stata data from Professor Jaeger’s research page (1980 Census file). The notebook explains the variable coding, provides import and setup code, and contains the questions and space for your analysis.
Complete all six parts in the notebook and submit your Quarto source and rendered PDF through Moodle.