Olli Ropponen, "Reconciling the Evidence of Card and Krueger (1994) and 
Neumark and Wascher (2000)", Journal of Applied Econometrics, Vol. 26, 
No. 6, 2011, pp. 1051-1057.

The study employs two distinct datasets: public.dat and payroll.dat. 
Both of these have been employed previously. The first dataset, 
public.dat, was introduced in

David Card and Alan B. Krueger, "Minimum Wages and Employment: A Case 
Study of the Fast-Food Industry in New Jersey and Pennsylvania", American 
Economic Review, 1994, 84, 772-793.

These data together with their description are available at

  http://www.irs.princeton.edu/Links/MinimumWage.php

and at

  http://econwww.mit.edu/faculty/angrist/data1/mhe/card.
  
The second dataset, payroll.dat, was introduced in

Neumark D, Wascher W. 2000.  Minimum Wages and Employment: A Case Study of
the Fast-Food Industry in New Jersey and Pennsylvania: Comment. American
Economic Review 90: 1362-1396.

The file payroll.dat is an ASCII file in DOS format. It is zipped in the
file data-or.zip. Unix/Linux users should use "unzip -a".

I refer to the original article for the definitions of the variables etc.
Shorthand notations on the variables relevant for this article are here:

Variable Shorthand				
					
V1	nmempa				
V2	hoursa				
V3	nmempb				
V4	hoursb				
V5	nmempc				
V6	hoursc				
V7	nmempd				
V8	hoursd				
V9	nmemp2a				
V10	hours2a				
V11	nmemp2b				
V12	hours2b				
V13	nmemp2c				
V14	hours2c				
V15	nmemp2d				
V16	hours2d				
V17	zip13				
V18	chain	BK: chain = 1	WE: chain =4	RR: chain = 3	KFC: chain = 2
V19	PA				
V20	NJ				
V21	fullzip				
V22	biwkly				
V23	mnthly				
V24	comp				

My program in R, Implementation_for_CK_and_NW.R, allows for the 
replication of the results and graphs of the study. The further 
details for using the code are provided among the code. This file, which is
an ASCII file in DOS format, is zipped in the file or-program.zip.
Unix/Linux users should use "unzip -a".

Olli Ropponen
olli.ropponen [AT] vatt.fi