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st: RE: differences in percentages across categories
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: RE: differences in percentages across categories
Date
Fri, 20 Jan 2012 13:27:20 +0000
And
Comparing Two Proportions from the Same Survey
C. J. Wild and G. A. F. Seber
The American Statistician , Vol. 47, No. 3 (Aug., 1993), pp. 178-181
Nick
[email protected]
-----Original Message-----
From: Nick Cox
Sent: 20 January 2012 13:25
To: '[email protected]'
Subject: RE: differences in percentages across categories
This sounds like
Difference of Proportions from the Same Survey
Alastair J. Scott and George A. F. Seber
The American Statistician , Vol. 37, No. 4, Part 1 (Nov., 1983), pp. 319-320
I am not aware of a canned implementation in Stata.
Nick
[email protected]
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Mirko Moro
Sent: 20 January 2012 10:47
To: [email protected]
Subject: st: differences in percentages across categories
Dear Statlisters,
Imagine I have 2 categorical variables, say Repair Record in 1978 and
Headroom (suppose I treat Headroom as categorical variable):
. sysuse auto
(1978 Automobile Data)
. tab rep78 headroom, row nofreq
Repair |
Record | Headroom (in.)
1978 | 1.5 2.0 2.5 3.0 3.5
4.0 | Total
-----------+------------------------------------------------------------------+----------
1 | 50.00 50.00 0.00 0.00 0.00
0.00 | 100.00
2 | 0.00 37.50 0.00 0.00 12.50
25.00 | 100.00
3 | 0.00 16.67 16.67 13.33 33.33
10.00 | 100.00
4 | 11.11 5.56 27.78 16.67 11.11
27.78 | 100.00
5 | 0.00 27.27 36.36 36.36 0.00
0.00 | 100.00
-----------+------------------------------------------------------------------+----------
Total | 4.35 18.84 20.29 15.94 18.84
14.49 | 100.00
Repair |
Record | Headroom (in.)
1978 | 4.5 5.0 | Total
-----------+----------------------+----------
1 | 0.00 0.00 | 100.00
2 | 12.50 12.50 | 100.00
3 | 10.00 0.00 | 100.00
4 | 0.00 0.00 | 100.00
5 | 0.00 0.00 | 100.00
-----------+----------------------+----------
Total | 5.80 1.45 | 100.00
I would like to test whether the percentage of car with headroom equal
to 1.5 inch vary across repair records, after that I wish to know
whether the percentage of car with headroom equal to 2.5 inch vary
across repair records, and so on.
Is there a way to do this or I need multinomial models with varying
baseline and reference categories?
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