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I use the Windows version of SPSS 29.When I use a transformation likecompute x=x+3.and 'x' does not exist in the active data set, I would expect SPSS to issue an error message (since one of the elements on the right side of the equal sign is non-existant). Instead, SPSS generates a new variable 'x' that is system-missing for all cases, without generating any message.Has this been the behavior of SPSS in previous versions as well (I can't test because both of my computers run version 29)? How can you compute a variable from a variable that does not exist? Clearly,compute y=x+3.gives an error message if 'x' does noit exist - but isn't the situation the same as in the example above?