I am trying to do a log transformation on my variables in spss and am getting this error message:

COMPUTE LogCurInKind=LG10(CurInkind).
EXECUTE.

>Warning # 601
>The argument for the log base 10 function is less than or equal to zero on the
>indicated command. The result has been set to the system-missing value.
>Command line: 25 Current case: 32 Current splitfile group: 1


>Warning # 601
>The argument for the log base 10 function is less than or equal to zero on the
>indicated command. The result has been set to the system-missing value.
>Command line: 25 Current case: 33 Current splitfile group: 1


>Warning # 601
>The argument for the log base 10 function is less than or equal to zero on the
>indicated command. The result has been set to the system-missing value.
>Command line: 25 Current case: 50 Current splitfile group: 1


>Warning # 601
>The argument for the log base 10 function is less than or equal to zero on the
>indicated command. The result has been set to the system-missing value.
>Command line: 25 Current case: 81 Current splitfile group: 1


>Warning # 601
>The argument for the log base 10 function is less than or equal to zero on the
>indicated command. The result has been set to the system-missing value.
>Command line: 25 Current case: 86 Current splitfile group: 1


>Warning # 601
>The argument for the log base 10 function is less than or equal to zero on the
>indicated command. The result has been set to the system-missing value.
>Command line: 25 Current case: 102 Current splitfile group: 1

any idea what's going on here and how to fix it?

many thanks,
L.

4/21/2010 1:17:32 PM