The name is absent



Stata Technical Bulletin

25


. npt_s r_area if quit~=O, by(quit)

quit

score

obs

sum of ranks

1.0

1.0

19

1062.ε

2.0

2.0

13

638. ε

3.0

3.0

ιε

εo8.ε

4.0

4.0

11

267.0

ε.o

ε.o

17

373. ε

Obs

Exp        Var

6800.ε

8322.0        79672

z = -ε.39, chi-squared(l) = 29.09

P>∣z∣ = 0.0000

It is likely that women of social classes 1 and 2 will have been more successful in giving up smoking.

. tab quit sc3 if quit~=0, row

Smokingl Social Class

3-5 I

Total

change I

1

2

>76 I

I

6

31.58

4

21.05

9 I

47.37 I

—

19

100.00

(.5,75] I
I

3

23.08

5

38.46

5 I

38.46 I

—

13

100.00

(.2s,.εj I
I

0
0.00

13

86.67

2 I

13.33 I

—

15

100.00

(0,.26] I
I

5

45.45

5

45.45

1 I

9.09 I

—

11

100.00

quit I

I

6

35.29

9

52.94

2 I

11.76 I

—

17

100.00

Total I

I

20

26.67

36

48.00

19 I

25.33 I

—

75

100.00

. npt_s sc3 if
quit

1.0

2.0

3.0

4.0

5.0

quit^=0

score

1.0

2.0

3.0

4.0

5.0

by(quit)
obs

19

13

15

11

17

Obs

7768.0

sum of ranks

811.0

554.0

632.5

311.0

541.5

Exp

8322.0

Var

79572

z = -1.96, chi-squared(l) =   3.86

P>∣z∣ = 0.0495

It is important to make sure that the observed association between smoking reduction and change in lesion size is not
confounded by the amount that the women smoked at the beginning of the study.

. tab quit init if quit"=0, row

Smoking I
change I

Initial No./day

21+ I

Total

1-10

11-20

>75 I

I

4

21.05

10

52.63

5 I

26.32 I

—

19

100.00

(.5,75] I
I

0
0.00

5

38.46

8 I

61.54 I

—

13

100.00

(.25,.5] I

I

3

20.00

10

66.67

2 I

13.33 I

—

15

100.00

(0,.25] I

I

7

63.64

4

36.36

0 I

0.00 I

—

11

100.00

— — ——— — ——— — —-f--
quit I

I

8

47.06

8

47.06

i I

5.88 I

—

17

100.00



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