Computer Exercises Econometrics
Computer Exercises
C1.2
Use the data in BWGHT.RAW to answer this question.
. summ
Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------------------------------
faminc | 1388 29.02666 18.73928 .5 65 cigtax | 1388 19.55295 7.795598 2 38 cigprice | 1388 130.559 10.24448 103.8 152.5 bwght | 1388 118.6996 20.35396 23 271 fatheduc | 1192 13.18624 2.745985 1 18
-------------+--------------------------------------------------------------------------------
motheduc | 1387 12.93583 2.376728 2 18 parity | 1388 1.632565 .8940273 1 6 male | 1388 .5208934 .4997433 0 1 white | 1388 .7845821 .4112601 0 1 cigs | 1388 2.087176 5.972688 0 50
-------------+--------------------------------------------------------------------------------------
lbwght | 1388 4.760031 .1906622 3.135494 5.602119 bwghtlbs | 1388 7.418723 1.272123 1.4375 16.9375 packs | 1388 .1043588 .2986344 0 2.5 lfaminc | 1388 3.071271 .9180645 -.6931472 4.174387
(i) How many women are in the sample, and how many report smoking during pregnancy?
Total number of women=1,388
. summ if cigs>0
Number of women who reported smoking during pregnancy=1,388-1177=212
(ii) What is the average number of cigarettes smoked per day?
. sum cigs
Average number of cigarettes smoked per day=2.087176
Is the average a good measure of the “typical” women in this case? Explain.
No, the average is not a good
C1.2
Use the data in BWGHT.RAW to answer this question.
. summ
Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------------------------------
faminc | 1388 29.02666 18.73928 .5 65 cigtax | 1388 19.55295 7.795598 2 38 cigprice | 1388 130.559 10.24448 103.8 152.5 bwght | 1388 118.6996 20.35396 23 271 fatheduc | 1192 13.18624 2.745985 1 18
-------------+--------------------------------------------------------------------------------
motheduc | 1387 12.93583 2.376728 2 18 parity | 1388 1.632565 .8940273 1 6 male | 1388 .5208934 .4997433 0 1 white | 1388 .7845821 .4112601 0 1 cigs | 1388 2.087176 5.972688 0 50
-------------+--------------------------------------------------------------------------------------
lbwght | 1388 4.760031 .1906622 3.135494 5.602119 bwghtlbs | 1388 7.418723 1.272123 1.4375 16.9375 packs | 1388 .1043588 .2986344 0 2.5 lfaminc | 1388 3.071271 .9180645 -.6931472 4.174387
(i) How many women are in the sample, and how many report smoking during pregnancy?
Total number of women=1,388
. summ if cigs>0
Number of women who reported smoking during pregnancy=1,388-1177=212
(ii) What is the average number of cigarettes smoked per day?
. sum cigs
Average number of cigarettes smoked per day=2.087176
Is the average a good measure of the “typical” women in this case? Explain.
No, the average is not a good