Hello
Using a syntax from Marta GG, I made several
comparisons that help me to decide, which “Gruppe” differ in the
proportion of “Yes” significantly from each other. It seemed to me
to working fine – until now with the data below.
What I’ve done and suppose:
I got a significant chi sq and an adjusted residual
for the “Gruppe” 1-3 of 2 resp. 2.1 for 4-10, which tells me, I suppose,
that in these two groups the proportion of “Yes” is significantly
higher than overall. So, the following syntax should show me, if these two
groups (or just one) have a significantly higher proportion of “Yes”
compared two each of the other groups.
What I do not understand:
But, with these data, there is no significant
difference in the proportion between the groups, contrary to what I expected,
because according to my assumption the significant Chi sq means, that there follows
at least one comparison that is significant.
Thanks for any explanations.
Tom
*****Beurteilung Fremdsprachen*****.
DATA LIST LIST/Gruppe Result Count(3 F8).
BEGIN DATA
1 1 53
2 1 154
3 1 262
4 1 288
5 1 187
1 2 19
2 2 46
3 2 49
4 2 54
5 2 36
END DATA.
WEIGHT BY Count .
VALUE LABELs Result 1'No' 2 'Yes'.
VALUE LABELs Gruppe 1'1-3' 2'4-10' 3'11-20' 4'21-30' 5'31-40'.
* A) Using CTABLES with Bonferroni adjustment *.
CTABLES
/VLABELS VARIABLES=Gruppe Result DISPLAY=DEFAULT
/TABLE Result [COUNT F40.0, COLPCT.COUNT PCT40.1] BY Gruppe
/SLABELS POSITION=ROW
/CATEGORIES VARIABLES=Gruppe Result ORDER=A KEY=VALUE
EMPTY=INCLUDE
/COMPARETEST TYPE=PROP ALPHA=0.05 ADJUST=BONFERRONI
ORIGIN=COLUMN
INCLUDEMRSETS=YES CATEGORIES=ALLVISIBLE.
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