how can you use age as a second level variable how to insert age in r model is itcf a variable for r what is the second level of logistic regression in r what is ltcf_type how to add ltcf to mrsa data can ltcf be 2nd level how to add ltcf_type to mrsa is ltcf a 2nd level variable in r what is ltcf_type why does ltcf_type need to be used for the second level of model can an elderly population be included in a ltcf which of the following is a second level variable and is used only for mrsa what is the second level variable of mrsa? why ltcf should be considered as a second level variable how to add itcf into linear regression how to add age to mrsa what is the ltcf_type what is ltcf_type which data level is the ltcf variable