I currently have a data set describing human subjects enrolled into an
international clinical trial, the name of the hospital enrolling this
human subject, the date when the subject was enrolled, and a vector
with variables representing characteristics of the site (e.g., number
of beds in a hospital).  my data sets looks like this:

subject hospital        date_enrollment hospital_beds
1       hospitalA       1/3/2002        300
2       hospitalA       1/6/2002        300
3       hospitalB       2/4/2002        150
4       hospitalC       3/2/2002        200

to perform a time series analysis I am now trying to get to a format
that would give me the following variables:

month   year    site    number_enrolled_subjects        hospital_beds

the data would be displayed on one-month intervals, and number of
subjects clustered around sites.

any help would be greatly appreciate

thanks


Ricardo

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