Wooldridge Source: L.E. Papke (1995), “Participation in and Contributions to 401(k) Pension Plans:Evidence from Plan Data,” Journal of Human Resources 30, 311-325. Professor Papke kindly provided these data. She gathered them from the Internal Revenue Service’s Form 5500 tapes. Data loads lazily.
data('k401k')A data.frame with 1534 observations on 8 variables:
prate: participation rate, percent
mrate: 401k plan match rate
totpart: total 401k participants
totelg: total eligible for 401k plan
age: age of 401k plan
totemp: total number of firm employees
sole: = 1 if 401k is firm's sole plan
ltotemp: log of totemp
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This data set is used in a variety of ways in the text. One additional possibility is to investigate whether the coefficients from the regression of prate on mrate, log(totemp) differ by whether the plan is a sole plan. The Chow test (see Section 7.4), and the less restrictive version that allows different intercepts, can be used.
Used in Text: pages 63, 79, 136, 174, 219, 692
str(k401k)
#> 'data.frame': 1534 obs. of 8 variables:
#> $ prate : num 26.1 100 97.6 100 82.5 ...
#> $ mrate : num 0.21 1.42 0.91 0.42 0.53 ...
#> $ totpart: num 1653 262 166 257 591 ...
#> $ totelg : num 6322 262 170 257 716 ...
#> $ age : int 8 6 10 7 28 7 31 13 21 10 ...
#> $ totemp : num 8709 315 275 500 933 ...
#> $ sole : int 0 1 1 0 1 1 1 0 1 1 ...
#> $ ltotemp: num 9.07 5.75 5.62 6.21 6.84 ...
#> - attr(*, "time.stamp")= chr "25 Jun 2011 23:03"