Computing optimal sampling designs for two-stage studies



45


Stata Technical Bulletin


43


mpg



ooooooooooo
ooooooooo
oooooooo
O O
OOOOOO
O O

-16


9 -

-10


1o^


Figure 1. A simple turnip plot for mpg for the auto data.

Figure 2. Higher resolution graph for mpg with line at median.

Finally, we do a turnip plot for only foreign cars with a specified ж-axis label and a horizontal line at the mean.

. turnip mpg if foreign==!, xlabel(-10 10) yline(mean)

# of observations per turnip row is the frequency below:

≡pg I

Freq.

Percent

Cum.

13.88521 I

1

4.55

4.55

16.19941 I

2

9.09

13.64

18.51361 I

2

9.09

22.73

20.82781 I

2

9.09

31.82

23.14201 I

4

18.18

50.00

25.45621 I

5

22.73

72.73

27.77042 I

1

4.55

77.27

30.08462 I

2

9.09

86.36

34.71302 I

2

9.09

95.45

41.65562 I

1

4.55

100.00

Total I

22

100.00

options: XlabeK-IO 10) yline(24.7) ylabel( 24.77272727272727 11 44 )

resolution: 2.314201283894056

yline: 24.77272727272727 (mean)

This gives the plot in Figure 3.

44 -

σ>

E

24.7727

11


h-
-10


Figure 3. Turnip plot for foreign cars with specified я-axis label and a horizontal line at the mean.



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