Hi there, I am trying to reconcile different parts of the output for PROC FMM with a PROBMODEL statement. Looking specifically at Table 43.12 in the example from the SAS documentation here, I understand that looking at the mixing probabilities table is showing the probabilities on the logit scale, which can then be converted to probabilities of belonging to component 1 (the mu-hats shown on the table). However, If I include an OUTPUT statement and look at the values PRED_1 and PRED_2 for the values of the covariates shown on the table, they don't seem to align. I may be missing something, but I couldn't find documentation on PRED_1 - PRED_2 that would explain the difference, so I appreciate any suggestions! Part two of this question is whether there is a way to obtain the odds ratios for the covariates in the mixture model, in the case that there are two components. I can back into it once the above is addressed and I am sure I am looking at the right values for the probabilities, but was curious if there is a more direct way to get this output from PROC FMM. Thanks again. data ossi;
length tx $8;
input tx$ n @@;
do i=1 to n;
input y m @@;
output;
end;
drop i;
datalines;
Control 18 8 8 9 9 7 9 0 5 3 3 5 8 9 10 5 8 5 8 1 6 0 5
8 8 9 10 5 5 4 7 9 10 6 6 3 5
Control 17 8 9 7 10 10 10 1 6 6 6 1 9 8 9 6 7 5 5 7 9
2 5 5 6 2 8 1 8 0 2 7 8 5 7
PHT 19 1 9 4 9 3 7 4 7 0 7 0 4 1 8 1 7 2 7 2 8 1 7
0 2 3 10 3 7 2 7 0 8 0 8 1 10 1 1
TCPO 16 0 5 7 10 4 4 8 11 6 10 6 9 3 4 2 8 0 6 0 9
3 6 2 9 7 9 1 10 8 8 6 9
PHT+TCPO 11 2 2 0 7 1 8 7 8 0 10 0 4 0 6 0 7 6 6 1 6 1 7
;
data ossi;
set ossi;
array xx{3} x1-x3;
do i=1 to 3; xx{i}=0; end;
pht = 0;
tcpo = 0;
if (tx='TCPO') then do;
xx{1} = 1;
tcpo = 100;
end; else if (tx='PHT') then do;
xx{2} = 1;
pht = 60;
end; else if (tx='PHT+TCPO') then do;
pht = 60;
tcpo = 100;
xx{1} = 1; xx{2} = 1; xx{3}=1;
end;
run;
proc fmm data=ossi;
class pht tcpo;
model y/m = / dist=binomcluster;
probmodel pht tcpo pht*tcpo;
output out = chk(keep = pht tcpo pred_:) pred(components);
run;
proc sort data = chk nodupkey; by pht tcpo; run;
proc print data = chk;
run;
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