Displaying 1 result from an estimated 1 matches for "obeservation_date".
2009 Jan 27
1
Creating list or numeric vectors out of selected columns of row oriented data
...orm the data so that I have an R object with a single entry for
each subject and start date and vectors for the observation dates and
the observations. The data are something like the following where for
each subject the subject_id does not change and the start_date does
not change, but the obeservation_date and the three different
observations change between rows. (There is one row for each day for
each subject over a three year period although some entered the study
late):
'subject_id', 'start_date','observation_date','weight_obs',
'activity_obs','c...