itsp

```
kww
variable:group
```

Variable Graph Type N Descriptives Label

[+] kww
@griliches76.dta

other
(float)

758
(41)

(x̄=36.574, 7.302) [12.000,56.000]

score on knowledge in world of work test

All properties
key	content
N	758
N_unique	41
class	other
example0	35
histh	.00161909, .00080955, .00242864, .00809547, .00323819, .01295275, .02266731, .00890501, .03076277, .01619093, .02995323, .05343008, .03400096, .05504917, .0728592, .03400096, .07366875, .03076277, .03885824, .03400096, .01133365, .02266731, .0121432, .00161909, .00161909
histw	12.814815, 14.444445, 17.703703, 19.333334, 20.962963, 22.592592, 24.222221, 25.851852, 27.481482, 29.111111, 30.74074, 32.370369, 34, 35.629631, 37.259258, 38.888889, 40.51852, 42.148148, 43.777779, 45.407406, 47.037037, 48.666668, 50.296295, 53.555557, 55.185184
label	score on knowledge in world of work test
max	56.000
mean	36.574
min	12.000
sd	7.302
type	float

file # command

ch14.9.do:

37 [+]

quietly ivreg2 lw s expr tenure rns smsa (iq=med kww age mrt) , gmm2s

44 [+]

quietly ivreg2 lw s expr tenure rns smsa (iq=med kww age mrt) , gmm2s robust

56 [+]

quietly ivreg2 lw s expr tenure rns smsa (iq=med kww age mrt) , cue

63 [+]

quietly ivreg2 lw s expr tenure rns smsa (iq=med kww age mrt) , cue robust

Data Manipulations with kww
file	#	command

Script Output


kww:  score on knowledge in world of work t     Number of Observations
------------------------------------------- ------------------------------
                                            Total   Integers   Nonintegers
|          #                 Negative           -         -          -
|          #   #             Zero               -         -          -
|          #   #             Positive         758       758          -
|          #   #                            -----     -----      -----
|      #   #   #             Total            758       758          -
|  .   #   #   #   .         Missing            -
+----------------------                     -----
12                   56                       758
  (41 unique values)

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
         kww |       758    36.57388    7.302247         12         56
@mean    36.574
@sd     7.302
@min    12.000
@max    56.000
@example0 35
@histh .00161909, .00080955, .00242864, .00809547, .00323819, .01295275, .02266731, .00890501, .03076277, .01619093, .02995323, .05343008, .03400096, .05504917, .0728592, .03400096, .07366875, .03076277, .03885824, .03400096, .01133365, .02266731, .0121432, .00161909, .00161909
@histw 12.814815, 14.444445, 17.703703, 19.333334, 20.962963, 22.592592, 24.222221, 25.851852, 27.481482, 29.111111, 30.74074, 32.370369, 34, 35.629631, 37.259258, 38.888889, 40.51852, 42.148148, 43.777779, 45.407406, 47.037037, 48.666668, 50.296295, 53.555557, 55.185184
@type float
@label score on knowledge in world of work test
@class other
@N_unique 41
@N 758