Only numbers

[SASPhile]

If data contains only digits or digits with decimals then would like to create a column "want" and assign those records to the column. tried compress function but it is compressing decimals too. 
Rawdata
UNKNOWN
37.5/25
37.5-25
0.25
25
10
1000IU

Rawdata         want             
UNKNOWN                     
37.5/25                            
0.25                0.25
25                    25
10                   10
1000IU                             

[Astounding]

This should do it:

want = input(rawdata, ??16.);

Since you didn't specify, this approach assumes you would like the new variable to be numeric, not character. 

[SASPhile]

Yes want is only Numeric an would like want_char with remaining values

[Astounding]

If you would like to add WANT_CHAR as well, it's easy enough:

want = input(rawdata, ??16.);
if want = . then want_char = rawdata;