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armoore
Fluorite | Level 6
  1. For the missing values in cholesterol. The code is not working for the output variable chol_status. Each time I run the code the output variable chol_status displays “Safe” instead of a blank space.
  • To identify missing values I thought you used:  if variable-name=. then variable-name=. ;   or               if missing(variable-name) then variable-name=. ;

What would be the correct code for missing values for ?

data results;
set "/home/u44696116/TheCut/input/input44.sas7bdat";
length chol_status $ 15;
drop bp_status weight_status smoking_status;
if cholesterol=. then chol_status=. ;
if cholesterol<200 then chol_status="Safe";
else if cholesterol<=239 then chol_status="High-Borderline";
else if cholesterol>=240 then chol_status="High";
run;



SAS ANSWER

data out;
set "/home/u44696116/TheCut/input/input44.sas7bdat";
length chol_status $ 15;
drop bp_status weight_status smoking_status;
if cholesterol ne . then do;
if cholesterol < 200 then chol_status='Safe';
else if cholesterol <=239 then chol_status='High-Borderline';
else if cholesterol >=240 then chol_status='High';
end;
run;

 

1 ACCEPTED SOLUTION

Accepted Solutions
Tom
Super User Tom
Super User

If the first place you reference the variable is when you are assigning it a numeric value then the variable will defined as numeric.  So define the variable BEFORE using it.

length chol_status $20;

Also you told it to set the missing value to Safe with this statement:

if cholesterol<200 then chol_status="Safe";

SAS will consider any of the 28 missing values that SAS supports as less than any valid value.

 

You probably meant to have another ELSE.

if missing(cholesterol) then chol_status=' ';
else if cholesterol < 200 then chol_status='Safe';
else if cholesterol <=239 then chol_status='High-Borderline';
else if cholesterol >=240 then chol_status='High';

 

View solution in original post

3 REPLIES 3
Tom
Super User Tom
Super User

If the first place you reference the variable is when you are assigning it a numeric value then the variable will defined as numeric.  So define the variable BEFORE using it.

length chol_status $20;

Also you told it to set the missing value to Safe with this statement:

if cholesterol<200 then chol_status="Safe";

SAS will consider any of the 28 missing values that SAS supports as less than any valid value.

 

You probably meant to have another ELSE.

if missing(cholesterol) then chol_status=' ';
else if cholesterol < 200 then chol_status='Safe';
else if cholesterol <=239 then chol_status='High-Borderline';
else if cholesterol >=240 then chol_status='High';

 

armoore
Fluorite | Level 6
Thank you
Jagadishkatam
Amethyst | Level 16

Alternatively you can try the proc format as below, for this you need to create a format and then use that format to derive a new variable.

 

Also, use the libname to call the dataset in the set statement.

 

proc format;
value chol
low-<200='Safe'
200-239='High-Borderline'
240-high='High'
other=' ';
run;

libname dat "/home/u44696116/TheCut/input";

data out;
	length chol_status $ 15;
	set dat.input44;
	drop bp_status weight_status smoking_status;
    chol_status=put(cholesterol,chol.);
run;
Thanks,
Jag

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