Hey guys,

I am a beginner in spss. My question is how do you know which cases spss takes/uses just by looking at the syntax.

For example:

COMPUTE hulpb2=(hulpbevalling + 1)*2.

COMPUTE duur=zwangerschapsduur - (9/3).

SELECT IF (hulpb2*duur lt -2).

There is a variable 'hulpbevalling' which contains 2 categories.

And there is a variable 'zwangerschapsduur' which contains 4 categories.

I dont quiete understand what the +1 means? What does the 1 add to?

And what does the *2 mean? I mean what does it multiply?

How can you multiply or add something to a variable? And how can you multiply 2 variables with eachother? What would the answer be then?

I thank you in advance,

Serpz