Paired sample t-test - cannot be computed

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M.LB
Posts: 1
Joined: Wed Apr 19, 2017 5:59 pm

Paired sample t-test - cannot be computed

Postby M.LB » Wed Apr 19, 2017 6:12 pm

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
statman
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Posts: 2690
Joined: Tue Jun 12, 2007 12:08 pm
Location: Florida, USA

Re: Paired sample t-test - cannot be computed

Postby statman » Thu Apr 20, 2017 12:47 pm

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 ..........
See the note below

NOTE: Please read the Posting Guidelines and always tell us your OS, the SPSS version and information about your study and data!

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