How can I obtain the variability of different values of a categorical variable by separating into strata?

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Sofía Mendoza
Sofía Mendoza 2024-11-4，14:03
Hello, I am replicating the results of a study using the following linear mixed-effects model:
The code is:
lme = fitlme(Tabla_datos, 'logxi ~ logH + Material + Material:logH + (1|key)', ...
'FitMethod', 'REML');
With this code, I was able to obtain the data for all fixed effects in the following table (highlighted in blue).
However, I still haven’t been able to achieve the results for variability by material (values highlighted in yellow in the table). I understand that MATLAB assumes a common sigma for all random effects, which is why I want to calculate this variability for the different categories (in this case: materials), treating each material as an independent stratum with its own variability.
Thank you in advance for your responses.

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