Hi,
Anyone can help me of how to code the below equation into SAS:
another one is (1e-6), how to code it in SAS?
Thanks in advance.
Hi @ursula,
You can also use the LOGISTIC function to make the code shorter:
FAST=logistic(-1.65+...);
EXP function for the e
** is power operator so for 2^3 you can do 2**3
@ursula wrote:
Hi,
Anyone can help me of how to code the below equation into SAS:
another one is (1e-6), how to code it in SAS?
Thanks in advance.
The 1E-6 is easy in SAS: That is acceptable as a fixed value though there might sometimes be some issues related to storage precision. The FORMAT you use to display the value might be of interest.
data example; file print; x=1E-6; put 'Best5. format' x= best5.; put '9.7 format ' x= 9.7; run;
Since you have the same long exponent in the numerator and denominator I would suggest calculating that as another variable and have much simpler code to type like
FAST = exp(thatvar)/ (1+Exp(thatvar));
The formula can be calculated in a single step, but as the same complex expression occurs twice, it is faster to calculate it in two steps:
FAST=exp(-1.65+1.07*log(LSM)+2.66E-8*CAP**3-63.3/AST);
FAST=FAST/(1+FAST);
- by "faster" I mean both the amount of typing to be done, and the CPU time for the calculation.
Hi @ursula,
You can also use the LOGISTIC function to make the code shorter:
FAST=logistic(-1.65+...);
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