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In reply to my question:

On Mon, Jun 13, 2011 at 6:21 PM, Partho Sarkar <> wrote:
> Hello all,
> I am quite new to Stata (and this list), and trying hard to quickly
> pick up the skills while on the job.  Would really appreciate some
> help with this task, and please excuse if this seems too elementary!
> Problem:
> I have a large dataset which gives prices of a commodity at each date
> for different markets across the country.  The markets are classified
> by State, District & Market (names).  (The commodity is only traded in
> some markets, in some districts, and some states).   I need to get an
> idea of the periods/dates for which the data are ?sparse?, i.e., there
> are too few of the Markets reporting a price.
> So I need,
> 1.      For each date, the total number of markets (over all states and
> districts) for which a price is reported, and
> 2.      The maximum number of markets for which a price is reported for any
> date in the dataset
> In addition, to do a geographical analysis, I would like to record,
> for each date
> 1.      The number of reporting markets in each district versus the total
> no. of markets in that district,
> 2.      The number of districts in each state for which prices are
> reported, versus the total no. of districts in that state
> 3.      Similarly, the number of states for which prices are reported,
> versus the total no. of state s where a price is ever reported
> I hope this is clear, as I think the List rules prevent me from
> including a preview/sample of my data.
> Thank you
> P. Sarkar
> Consultant Econometrician
> India

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