{"part":"task","text":"# Datasets\nPass a dataset's id as the `dataset` argument.\n{\n \"id\": \"jtrain\",\n \"rows\": 471,\n \"description\": \"Wooldridge's JTRAIN data (Holzer, Block, Cheatham and Knott's Michigan job-training survey; R package wooldridge): one row per firm and year, 157 firms over 1987-1989 (471 rows); scrap rates exist for a subset of firms. Columns: rownames, a row number; year; fcode, firm code; employ, employees; sales, annual sales (dollars); avgsal, average employee salary; scrap, scrap rate (per 100 items); rework, rework rate; tothrs, total hours of training; union, 1 if unionized; grant, 1 if the firm received a job-training grant in that year; d88 and d89, 1 for 1988 and 1989; totrain, total employees trained; hrsemp, training hours per employee; lscrap, log of scrap; lemploy, lsales, lrework, lhrsemp, logs of those columns; lscrap_1, lscrap lagged one year; grant_1, grant lagged one year; clscrap, cgrant, clemploy, clsales, lavgsal, clavgsal, cgrant_1, chrsemp, clhrsemp, first differences and logs of the named columns.\",\n \"columns\": {\n  \"rownames\": \"int64\",\n  \"year\": \"int64\",\n  \"fcode\": \"int64\",\n  \"employ\": \"float64\",\n  \"sales\": \"float64\",\n  \"avgsal\": \"float64\",\n  \"scrap\": \"float64\",\n  \"rework\": \"float64\",\n  \"tothrs\": \"float64\",\n  \"union\": \"int64\",\n  \"grant\": \"int64\",\n  \"d89\": \"int64\",\n  \"d88\": \"int64\",\n  \"totrain\": \"float64\",\n  \"hrsemp\": \"float64\",\n  \"lscrap\": \"float64\",\n  \"lemploy\": \"float64\",\n  \"lsales\": \"float64\",\n  \"lrework\": \"float64\",\n  \"lhrsemp\": \"float64\",\n  \"lscrap_1\": \"float64\",\n  \"grant_1\": \"int64\",\n  \"clscrap\": \"float64\",\n  \"cgrant\": \"int64\",\n  \"clemploy\": \"float64\",\n  \"clsales\": \"float64\",\n  \"lavgsal\": \"float64\",\n  \"clavgsal\": \"float64\",\n  \"cgrant_1\": \"float64\",\n  \"chrsemp\": \"float64\",\n  \"clhrsemp\": \"float64\"\n }\n}"}