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Paired sample t-test - cannot be computed

Posted: Wed Apr 19, 2017 6:12 pm
by M.LB
Hi,

I am trying to do a paired sample t test between values of SF-12 physical pre (A) and post (B). This is my syntax:

T-TEST PAIRS=A_SF12PhysicaHealth WITH B_SF12PhysicaHealth (PAIRED)
/CRITERIA=CI(.9500)

/MISSING=ANALYSIS

However, I always get this message:
"The correlation and t cannot be computed because there are no valid pairs"
And no output.

I am comparing 20 data entries with 20 other data entries.
How can I get rid of this issue? Did I miss something?

I imported my data from Excel.

Any help appreciated...
Thanks!

MLB

Re: Paired sample t-test - cannot be computed

Posted: Thu Apr 20, 2017 12:47 pm
by statman
Initial reaction is that the data are not imported right of the measurement levels are set wrong but can you post a photo of your data and ..........

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