plot_group: A function to generate plots of a group of variables...
In biocore/bayestime: (***)

A function to generate plots of a group of variables Suggestion: take out missing values beforehand

1	plot_group(data, time_name, response_name, unique_subject_id, variable_name)

`unique_subject_id`	the column name corresponding to unique subject id in the data (string)
`variable_name`	One column name of interested variable from dataset
`data:`	A dataframe with the response column to plot
`time_name:`	the column name corresponding to the time variable in the data (string)
`response_name:`	the column name of the intersted response variable (string)