njmin: Data from the Card and Krueger 1994 paper _Minimum Wages and...
In b-rodrigues/diffindiff:

This dataset was downloaded and distributed with the permission of David Card. The original data contains 410 observations and 46 variables. The data distributed in this package is exactly the same, but was changed from a wide to a long dataset, which is better suited for manipulation with tidyverse functions.

njmin

A data frame with 820 rows and 28 variables:

sheet: Sheet number (unique store id).
chain: The fastfood chain: bk is Burger King, kfc is Kentucky Fried Chicken, wendys is Wendy's, roys is Roy Rogers.
state: State where the restaurant is located.
region: pa1 is northeast suburbs of Phila, pa2 is Easton etc, centralj is central NJ, northj is northern NJ, southj is south NJ.
observation: Date of first (February 1992) and second (November 1992) observation.
co_owned: "Yes" if company owned.
ncalls: Number of call-backs. Is 0 if contacted on first call.
empft: Number full-time employees.
emppt: Number part-time employees.
nmgrs: Number of managers/assistant managers.
wage_st: Starting wage ($/hr).
inctime: Months to usual first raise.
firstinc: Usual amount of first raise (\$/hr).
bonus: "Yes" if cash bounty for new workers.
pctaff: % of employees affected by new minimum.
meals: Free/reduced priced code.
open: Hour of opening.
hrsopen: Number of hours open per day.
psode: Price of medium soda, including tax.
pfry: Price of small fries, including tax.
pentree: Price of entree, including tax.
nregs: Number of cash registers in store.
nregs11: Number of registers open at 11:00 pm.
type: Type of 2nd interview.
status: Status of 2nd interview.
date: Date of 2nd interview.
nregs11: "Yes" if special program for new workers.