Hi all,
I have below derivation, can anyone help how can I implement this in sas?
Thanks,
Adithya
Depends on your data set up to some degree.
Assuming you have a data set with SCR, AGE and SEX as variables.
if sex='Female' then eGFR = 194
*(SCR**(1.094))
*(AGE**(-0.287))
*0.739;
else if sex = 'Male' then eGFR = 194
*(SCR**(1.094))
*(AGE**(-0.287));
@chinna0369 wrote:
Hi all,
I have below derivation, can anyone help how can I implement this in sas?
Thanks,
Adithya
I don't see a square root anywhere much less a negative one.
In SAS you use the ** operator to exponentiate a value:
data example; x= 123; /* calculate x squared*/ y= x**2; /* x to the minus 0.287 power*/ z= x**(-0.287); run;
Hello @chinna0369
I would like to point that negative numbers have no real square root.
Incidentally in solving your equation there is no need to calculate a square root.
There are many approaches to solve your equations, I would prefer the following.
I am first creating a user defined function. This function can be used like any other function.
Then I have shown an example usage.
/* Creating function*/
proc fcmp outlib=work.userfuncs.mymath;
function egfr(gender, scr,age);
term1=194*input(&scr.,best12.)**(-1.094) *input(&Age.,best12.)**(-0.287);
if(upcase("&gender") eq "MALE")then factor=1;
else factor=0.739;;
return (factor*term1);
endsub;
/* Example usage*/
options cmplib=work.userfuncs;
data _null_;
Gender=female;
scr=100;
age=50;
egfr=egfr(gender,scr,age);
put egfr=;
run;
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