Hi everyone,
Below is the code I use to generate estimates with the probit procedure (and some sample data). This gives me a curve where x=chemical concentration and y=percent mortality. I would like to calculate the slope of this curve. Can anyone give me the line of code to add the slope calculation into this?
I use SAS 9.3 for Windows 64-bit.
Many thanks!
*
data sulfate;
input form $ dead total conc @@;
prop = dead/total;
datalines;
A 3 140 0
A 6 127 1000
A 6 69 2000
A 3 22 2500
A 5 68 3000
A 2 69 4000
A 10 94 5000
A 11 66 6000
A 19 74 7000
A 8 22 7500
A 11 21 9000
A 11 21 10000
A 20 31 15000
A 10 31 18000
A 33 51 20000
A 45 56 25000
A 19 20 30000
;
ods rtf;
proc sort;
by form;
run;
proc probit log10 inversecl lackfit;
model dead/total = conc/d = normal itprint;
output out=p p=prob std=std xbeta=xbeta;
by form;
run;
ods rtf close;
It is not clear what should be called a slope in your probit model (what units are you expecting), but you can get the parameter estimates in a dataset with the ODS statement:
ods output ParameterEstimates=myEstimates;
PG
Thank you so much PG!
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