{"part":"task","text":"# Datasets\nPass a dataset's id as the `dataset` argument.\n{\n \"id\": \"card\",\n \"rows\": 3010,\n \"description\": \"Wooldridge's CARD data set (the R package wooldridge, served by Rdatasets): David Card's (1995) sample of men from the National Longitudinal Survey of Young Men, observed in 1976; one row per man (3,010 rows). 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.\",\n \"columns\": {\n  \"rownames\": \"int64\",\n  \"id\": \"int64\",\n  \"nearc2\": \"int64\",\n  \"nearc4\": \"int64\",\n  \"educ\": \"int64\",\n  \"age\": \"int64\",\n  \"fatheduc\": \"float64\",\n  \"motheduc\": \"float64\",\n  \"weight\": \"int64\",\n  \"momdad14\": \"int64\",\n  \"sinmom14\": \"int64\",\n  \"step14\": \"int64\",\n  \"reg661\": \"int64\",\n  \"reg662\": \"int64\",\n  \"reg663\": \"int64\",\n  \"reg664\": \"int64\",\n  \"reg665\": \"int64\",\n  \"reg666\": \"int64\",\n  \"reg667\": \"int64\",\n  \"reg668\": \"int64\",\n  \"reg669\": \"int64\",\n  \"south66\": \"int64\",\n  \"black\": \"int64\",\n  \"smsa\": \"int64\",\n  \"south\": \"int64\",\n  \"smsa66\": \"int64\",\n  \"wage\": \"int64\",\n  \"enroll\": \"int64\",\n  \"KWW\": \"float64\",\n  \"IQ\": \"float64\",\n  \"married\": \"float64\",\n  \"libcrd14\": \"float64\",\n  \"exper\": \"int64\",\n  \"lwage\": \"float64\",\n  \"expersq\": \"int64\"\n }\n}"}