Hi Ryan,
You can use categorical or nominal to specify the first category. Here's an example:
% 0. Dummy data.
rng(0,'twister');
y = rand(30,1);
g = [zeros(10,1);ones(10,1);2*ones(10,1)];
T = table(y);
% 1. First category is automatically set based on sort order. In this
% case it will be 0.
T.g = categorical(g);
lme = fitlme(T,'y ~ g')
% 2. Make 2 the first category.
T.g = categorical(g,[2,0,1]);
lme = fitlme(T,'y ~ g')
% 3. Same as 1 but using nominal.
T.g = nominal(g);
lme = fitlme(T,'y ~ g')
% 4. Same as 2 but using nominal.
gn = nominal(g);
getlabels(gn)
gn = reorderlevels(gn,{'2','0','1'});
T.g = gn;
lme = fitlme(T,'y ~ g')
Hope this helps,
Gautam
