* use http://www.ats.ucla.edu/stat/stata/webbooks/reg/elemapi2 describe list api00 ell meals yr_rnd mobility acs_k3 acs_46 full emer enroll in 1/5 codebook api00 ell meals yr_rnd mobility acs_k3 acs_46 full emer enroll summarize api00, detail histogram api00, normal graph box api00 summarize ell, detail histogram ell graph box ell summarize meals, detail histogram meals graph box meals summarize yr_rnd, detail histogram yr_rnd graph box yr_rnd summarize mobility, detail histogram mobility graph box mobility summarize acs_k3, detail histogram acs_k3 graph box acs_k3 summarize acs_46, detail histogram acs_46 graph box acs_46 summarize full, detail histogram full graph box full summarize emer, detail histogram emer graph box emer summarize enroll, detail histogram enroll graph box enroll ladder enroll gladder enroll generate lenroll = log(enroll) histogram lenroll, normal regress api00 lenroll scatter api00 lenroll twoway (scatter api00 lenroll) (lfit api00 lenroll) pwcorr api00 lenroll, sig regress api00 acs_k3 meals full lenroll