Propensity score Matching SPSS 23 ERROR: weights.matrix(…): No units were matched,PS Matching – weights.matrix(…): No units were matched

Hi!

I’m trying to perform a PSM with SPSS 23 but I get the following error:
weights.matrix(…): No units were matched.

May you help me, please?
Thx
Alberto,Hi!

I’m trying to perform a propensity score matching with spss 23 but I get the following error message: weights.matrix(…): No units were matched.

May you help me please?
Thx
Alberto

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