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In Simbiology, should the categorical variables be assigned as group variable or covariate in the dataset?

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I am using Simbiology for population pharmacokinetic model development. I use non-linear mixed effect modelling approach. I have a doubt in the intial assignment of data type in the dataset.
Suppose I have age and gender in the dataset. Clearly, I will assign age as covariate. Now gender is also a covariate. But there is a option in the dataset type which is group variable.
Now I am confused on whether I should assign gender as covariate or group variable.?
I am attaching a screenshot for the reference.

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Jeremy Huard
Jeremy Huard el 17 de Jun. de 2019
Group variable defines an index for a subject/experiment. In your dataset, ID is a group variable. Gender and age can be both covariates.

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Praveen Kumar M
Praveen Kumar M el 17 de Jun. de 2019
Oh. That's a clear answer. I have a logical query. Among the covariate, one is a categorical variable (gender) and another is a continuous variable (age). How do I incorporate this information in the dataset / modelling?
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Jeremy Huard
Jeremy Huard el 17 de Jun. de 2019
It is not necessary to define it as categorical. But covariates require numerical data in SimBiology. In your case, since you have a binary covariate, you could set gender to 1 for female, 0 for male.

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