The TTEST Procedure
Paired Design
Define the following notation:
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Normal Difference (DIST=NORMAL TEST=DIFF)
The analysis is the same as the analysis for the one-sample design in the section Normal Data (DIST=NORMAL) based on the differences
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Lognormal Ratio (DIST=LOGNORMAL TEST=RATIO)
The analysis is the same as the analysis for the one-sample design in the section Lognormal Data (DIST=LOGNORMAL) based on the ratios
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Normal Ratio (DIST=NORMAL TEST=RATIO)
The hypothesis 
, where 
and 
are the means of the first and second PAIRED variables, respectively, can be rewritten as 
. The 
value and 
-value are computed in the same way as in the one-sample design in the section Normal Data (DIST=NORMAL) based on the transformed values
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Estimates and confidence limits are not computed for this situation.