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How to convert Char to Numeric

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New Contributor
Posts: 3

How to convert Char to Numeric

 

Given Dataset: All hav Char type, i need to change the date type to numeric with odinal value.

Gender

MarriedDependentsEducation
MaleYes0Graduate
MaleYes1Graduate
MaleYes2Graduate
MaleYes2Graduate
MaleNo0Not Graduate
MaleYes0Not Graduate

 

Used Proc format  to change the format:
proc format;
value $G
'Male'=1 'Female'=0;
Value $M
'Yes'=1 'No'=0;
value $D
"0"=0 "1"=1 "2"=2 "3+"=3;
value $E
"Graduate"=1 "Not Graduate"=0 ;

run;

 

BUT NOW HOW I CAN CHANGE THE TYPE FROM CHAR TO NUMERIC??

 

 

 

Contributor
Posts: 24

Re: How to convert Char to Numeric

[ Edited ]

Hi. 

 

It actually works if you explicitly define the needed vars as numeric.

 

You can use the LENGTH statement for this.

 

data _OUT1;
     length GENDERN 8.;
     GENDERN=put('Male',$G.);
run;

 

Off course this will produce a warning, as SAS is implictly doing the type conversion for you.

 

Another way of doing this, and surely the right way would be to create numeric informats instead of formats.

 

For example:

 

proc format;
     invalue G
           'Male'=1 'Female'=0;
     invalue M
           'Yes'=1 'No'=0;
     invalue D
           "0"=0 "1"=1 "2"=2 "3+"=3;
     invalue E
           "Graduate"=1 "Not Graduate"=0 ;

run;

 

data _OUT2;
     GENDERN=input('Male',G.);
run;

 

Hope it helps.

 

Daniel Santos @ www.cgd.pt

Respected Advisor
Posts: 3,894

Re: How to convert Char to Numeric

Not sure why you have to recode your variables this way but to answer your question: Use a numeric INformat as this will allow you to read a string and translate it into a numeric value.

proc format;
  invalue sex_num
    "Male" =1
    "Female"=2
    other=99
   ;
quit;

data sample;
  sex="Female";
  sex2=input(sex,sex_num.);
run;

 

New Contributor
Posts: 3

Re: How to convert Char to Numeric

Need to run regression model. Thanks for the help
Respected Advisor
Posts: 3,894

Re: How to convert Char to Numeric

If your source data is not already standardized then also use the UPCASE option so that the informat is no more case sensitive.

proc format;
  invalue sex_num (just upcase)
    "MALE"  =1
    "FEMALE"=2
    other=99
    ;
quit;

data sample;
  sex="female";
  sex2=input(sex,sex_num.);
run;

UPCASE

converts all raw data values to uppercase before they are compared to the possible ranges. If you use UPCASE, then make sure the values or ranges that you specify are in uppercase.

http://support.sas.com/documentation/cdl/en/proc/69850/HTML/default/viewer.htm#p1pmw90bl3jzgdn1w4202...

 

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