[R] converting a data set to a format for time series analysis

From: Ricardo Pietrobon <pietr007_at_gmail.com>
Date: Mon, 09 Jun 2008 12:45:59 -0400

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



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