This is a real dataset from guinea pigs.
The dataset contains testosterone measurements ('Testo') of 31 male guinea pigs, each measured at 5 time points. (age between 120 and 240 days at 30-day intervals). As covariates the dataset contains the time point of measurement ('Time') and a rank index derived from behavioral observations ('Rank') around the time of measurement (see Mutwill et al. in prep. for details).
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