Example of a paired preference test
This example tests whether the number of respondents preferring brand A is significantly different from the number preferring brand B.
tab opref age;notauto
tstat ppt;elms=AB;ppnse
foot
ttlRows tested A B with nse
l age
n0113-29;c=c205'12'
n0113-39;c=c205'123'
n0113-55;c=c205'1/5'
g Target Total
g market Respondents respondents
g age 13-29 age 13-39 age 13-55
u2
p x x x
l opref
n10Base
n03Overall preference
n01Prefer Brand A (A);c=c209'1';id=A
n01Prefer Brand B (B);c=c209'2';id=B
n01No preference;c=c209'3'
stat ppt,Paired Preference
n03
n01Total;c=c209'123';notstat
The table produced is:
Target Total
market Respondents Respondents
age 13-29 age 13-39 age 13-55
------------- ------------- ------------
Base 206 275 303
Overall preference
Prefer Brand A (A) 104 147 166
Prefer Brand B (B) 101 126 135
No Preference 1 2 2
Paired Preference E NS NS
Total 206 275 303
Rows tested A B with nse |
In this example, the paired preference row shows that in the target market there are no significant differences at the 5% risk level between the number of respondents preferring Brand A and Brand B. However, there are significant differences at the 5% risk level in the other categories.
See also