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Columns used here: lwage, log hourly wage in 1976; educ, years of schooling in 1976; nearc4, 1 if the man grew up near a four-year college in 1966; nearc2, 1 if near a two-year college in 1966; exper, years of experience (age - educ - 6); expersq, exper squared; black, 1 if black; smsa, 1 if living in an SMSA in 1976; south, 1 if living in the South in 1976; smsa66, 1 if living in an SMSA in 1966; reg661 to reg669, indicators of the region of residence in 1966; also age, fatheduc, motheduc, IQ, KWW, married, wage (cents per hour) and the family-background indicators momdad14, sinmom14, step14, south66, libcrd14, enroll, weight, id and rownames.","file_sha256":"326dad817467b20d51bdfd015033e3e3e313931f51f812c38c0776249e7fd711","format":"csv","frame_sha256":null,"generator":null,"kind":"file","licence":"GPL-3 (R package wooldridge); fetched, not redistributed.","member":null,"object":null,"params":{},"path":null,"read_kw":{},"records":null,"role":"agent","sha256":"326dad817467b20d51bdfd015033e3e3e313931f51f812c38c0776249e7fd711","transforms":[],"url":"https://raw.githubusercontent.com/vincentarelbundock/Rdatasets/1dcc2bf5f955cc1224a3e1307256e1fe86b68dae/csv/wooldridge/card.csv"}},"difficulty":"E","id":"paper_repro.card_1995.ex15_4_iv.tool","level":"T1","meta":{"acceptable_tools":["infer.iv_2sls"],"cluster":"card_1995","contamination":{"benchmark_first_public":"2020-01","gold_in_public_repo":true,"model_reported_cutoff":null,"url":"https://www.cengage.com/c/introductory-econometrics-a-modern-approach-7e-wooldridge/9781337558860/"},"expected_tool":"infer.iv_2sls","family":"iv","kind":"tool","known_deviation":null,"locator":"Wooldridge (2020), Example 15.4 'Using College Proximity as an IV for Education', Table 15.1 (dependent variable log(wage)), column IV, row educ","n_published":3010,"paper":"card_1995","se_policy":{"basis":"The example's text says the reported IV standard errors, like the OLS ones, use a degrees-of-freedom adjustment in the error variance.","convention":"classical (homoskedastic), n - k","never_required":false,"stated_in_question":false},"target":"ex15_4_iv","trap_tools":[]},"question":"","requires":[],"runner":null,"sources":["card_1995.ex15_4_iv.paper","card_1995.ex15_4_iv.software"],"split":"public","suite":"paper_repro","tags":["paper_repro","card_1995","iv"],"target":"tool","tool":"infer.iv_2sls","truth":"Wooldridge, J. M. (2020). Introductory Econometrics: A Modern Approach, 7th edition. Boston: Cengage. Example 15.4 (Card 1995, 'Using Geographic Variation in College Proximity to Estimate the Return to Schooling', data set CARD). The cell predates this edition: the example's specification and IV estimate replicate Card (1995), so 'published' (the edition read) understates how long the cell has been public. Wooldridge (2020), Example 15.4 'Using College Proximity as an IV for Education', Table 15.1 (dependent variable log(wage)), column IV, row educ (source card_1995.ex15_4_iv.paper); software reference card_1995.ex15_4_iv.software: linearmodels 7.0: the reference specification of card_1995 ex15_4_iv (infer.iv_2sls, figure 'coef.educ') on an independent code path"}