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Some states first raised their minimum wage in 2004, some in 2006 and some in 2007; the others did not in the window. Columns: countyreal, the county id; year; lemp, the log of county teen employment; lpop, the log of county population; first_treat, the year the county's state first raised its minimum wage (2004, 2006 or 2007; 0 for counties never treated in the window); treat, 1 for counties in states that raised it at some point in the window.","file_sha256":"0be3bc5eaaedaa50e047deaf45ad0e193e7210df1644103c63a6c1baa75965d4","format":"rdata","frame_sha256":null,"generator":null,"kind":"file","licence":"R package did (GPL-2); fetched, not redistributed.","member":null,"object":"mpdta","params":{},"path":null,"read_kw":{},"records":null,"role":"agent","sha256":"0be3bc5eaaedaa50e047deaf45ad0e193e7210df1644103c63a6c1baa75965d4","transforms":[{"args":{"map":{"first.treat":"first_treat"}},"op":"rename"}],"url":"https://raw.githubusercontent.com/bcallaway11/did/9c930239f718c4196353aa27525c09f458f29712/data/mpdta.rda"}},"difficulty":"H","id":"paper_repro.callaway_santanna_2021.mpdta_att_gt.agent","level":"T2","meta":{"acceptable_tools":["infer.did_staggered"],"alternatives":[{"args":{"dataset":"mpdta","first_treat":"first_treat","time":"year","unit":"countyreal","y":"lemp"},"note":"T3 only: an event-study regression of the effect by time since adoption, an answer to the question of how the effect evolved; it does not state the group-time cells T2 checks","tool":"infer.event_study"}],"answer_format":{"figure_transform":"identity","round_to":null,"unit_scale":1.0},"cluster":"callaway_santanna_2021","contamination":{"benchmark_first_public":"2021-12","gold_in_public_repo":true,"model_reported_cutoff":null,"url":"https://doi.org/10.1016/j.jeconom.2020.12.001"},"expected_tool":"infer.did_staggered","family":"did","headline_keys":{"infer.did_staggered":["att"]},"kind":"agent","known_deviation":null,"locator":"did package home page (2.5.1), mpdta example, summary(out): the 12 group-time average treatment effects ATT(g,t)","n_published":2500,"paper":"callaway_santanna_2021","question_states":[],"reference":{"cite":1,"steps":[{"args":{"control_group":"never_treated","dataset":"mpdta","first_treat":"first_treat","time":"year","unit":"countyreal","y":"lemp"},"tool":"infer.did_staggered","why":"att_gt(yname = 'lemp', gname = 'first.treat', idname = 'countyreal', tname = 'year', xformla = ~1, data = mpdta, est_method = 'reg'): never-treated control group, no covariates, varying base period (the package defaults)"}]},"se_policy":{"basis":"The package page prints bootstrap SEs, and they moved between two copies of the page (0.0243 to 0.0246, 0.0203 to 0.0219); DESIGN.md 1.3 and validity-12: bootstrap SEs are never required.","convention":"multiplier bootstrap (the did package's default); infer.did_staggered reports its own seeded bootstrap","never_required":true,"stated_in_question":false},"target":"mpdta_att_gt","trap_tools":[]},"question":"Callaway and Sant'Anna (2021), 'Difference-in-Differences with Multiple Time Periods', as in the did package's documented example on its county panel (2003-2007): estimate the group-time average treatment effects ATT(g,t) of a state minimum-wage increase on log county teen employment, for each adoption cohort (2004, 2006, 2007) and each period from 2004 to 2007, using the never-treated counties as the comparison group, no covariates and the package's default (varying) base period. Report the group-time effects.","requires":[],"runner":null,"sources":["callaway_santanna_2021.mpdta_att_gt.g2004_t2004.paper","callaway_santanna_2021.mpdta_att_gt.g2004_t2004.software","callaway_santanna_2021.mpdta_att_gt.g2004_t2005.paper","callaway_santanna_2021.mpdta_att_gt.g2004_t2005.software","callaway_santanna_2021.mpdta_att_gt.g2004_t2006.paper","callaway_santanna_2021.mpdta_att_gt.g2004_t2006.software","callaway_santanna_2021.mpdta_att_gt.g2004_t2007.paper","callaway_santanna_2021.mpdta_att_gt.g2004_t2007.software","callaway_santanna_2021.mpdta_att_gt.g2006_t2004.paper","callaway_santanna_2021.mpdta_att_gt.g2006_t2004.software","callaway_santanna_2021.mpdta_att_gt.g2006_t2005.paper","callaway_santanna_2021.mpdta_att_gt.g2006_t2005.software","callaway_santanna_2021.mpdta_att_gt.g2006_t2006.paper","callaway_santanna_2021.mpdta_att_gt.g2006_t2006.software","callaway_santanna_2021.mpdta_att_gt.g2006_t2007.paper","callaway_santanna_2021.mpdta_att_gt.g2006_t2007.software","callaway_santanna_2021.mpdta_att_gt.g2007_t2004.paper","callaway_santanna_2021.mpdta_att_gt.g2007_t2004.software","callaway_santanna_2021.mpdta_att_gt.g2007_t2005.paper","callaway_santanna_2021.mpdta_att_gt.g2007_t2005.software","callaway_santanna_2021.mpdta_att_gt.g2007_t2006.paper","callaway_santanna_2021.mpdta_att_gt.g2007_t2006.software","callaway_santanna_2021.mpdta_att_gt.g2007_t2007.paper","callaway_santanna_2021.mpdta_att_gt.g2007_t2007.software"],"split":"public","suite":"paper_repro","tags":["paper_repro","callaway_santanna_2021","did"],"target":"agent","tool":null,"truth":"Callaway, B. and Sant'Anna, P. H. C. (2021). Difference-in-Differences with Multiple Time Periods. Journal of Econometrics 225(2): 200-230. Cells from the did R package's documented example on its mpdta data (a software reference benchmark, not a table of the paper). did package home page (2.5.1), mpdta example, summary(out): the 12 group-time average treatment effects ATT(g,t) (source callaway_santanna_2021.mpdta_att_gt.g2004_t2004.paper and 12 table cells)"}