why use glee and mixed-effects model for twins is sas linear mixed effects why do we use gile model? what modeling method should be used for biomarker data when are mz twins cross sectional when to use mixed effects model what type of model for longitudinal twins what model would you use to analyze mz dz twin biomarkers does the twin biomarker correlate to physiological biomarker? what models do i use for biomarker data? when to model insomnia in twins in giles what model to use for cross sectional twins which is an appropriate model to analyze transsectional twin data what modeling is needed for a twin what is the relationship between biomarker and sleep why do they use mixed models for twins what model is best for interquartile twins why use mixed methods for twin data can i analyze twin data in spss? how many pairs of mz twins are analyzed