Joshua Angrist, Guido Imbens, and Allan Krueger, "Jackknife Instrumental Variables Estimation", Journal of Applied Econometrics, Vol. 14, No. 1, 1999, pp. 57-67. The ascii file JIVE.DAT (in DOS format) obtained by unzipping jive.zip contains 329509 observations on five variables. There is one observation per row. The order of the variables is 1. year of birth 2. state of birth 3. quarter of birth 4. years of education 5. log wage The following matlab program reads in the data and calculates the summary statistics. The results should be: Number of observations: 329509 Number of variables: 5 yob sob qob educ lwage 30.0000 1.0000 1.0000 0 -2.3418 min 39.0000 56.0000 4.0000 20.0000 10.5321 max 34.6028 30.6926 2.5064 12.7699 5.8999 mean 2.9050 14.2184 1.1119 3.2812 0.6788 sd 35.0000 34.0000 3.0000 12.0000 5.9525 median Matlab program to read in data and get summary statistics: diary e:\data\jive\jive.dia load e:\data\jive\jive.dat yob=jive(:,1); % year of birth sob=jive(:,2); % state of birth qob=jive(:,3); % quarter of birth educ=jive(:,4); % years of education lwage=jive(:,5); % log wage size(jive) 'yob sob qob educ lwage' [min(jive);max(jive);mean(jive);std(jive);median(jive)] diary off %clear jive %save e:\data\jive\jive yob sob qob educ lwage