odev 4

library(wooldridge)
data(wage2)

head(wage2)

##   wage hours  IQ KWW educ exper tenure age married black south urban sibs
## 1  769    40  93  35   12    11      2  31       1     0     0     1    1
## 2  808    50 119  41   18    11     16  37       1     0     0     1    1
## 3  825    40 108  46   14    11      9  33       1     0     0     1    1
## 4  650    40  96  32   12    13      7  32       1     0     0     1    4
## 5  562    40  74  27   11    14      5  34       1     0     0     1   10
## 6 1400    40 116  43   16    14      2  35       1     1     0     1    1
##   brthord meduc feduc    lwage
## 1       2     8     8 6.645091
## 2      NA    14    14 6.694562
## 3       2    14    14 6.715384
## 4       3    12    12 6.476973
## 5       6     6    11 6.331502
## 6       2     8    NA 7.244227