Hi,
I have global national statistics (GDP, Fish Catch etc.), which I would like to aggregate to and calculate per Capita data for given regions (Africa, Europe...) and subregions (Western Africa, ....) on-the-fly.
From a statistical point of view it seems best to use something like this:
given that the variable is "v" and the Total Population table is "tp":
(country_1_of_region_1_for_v / country_1_of_region_1_for_tp) + (country_2_of_region_1_for_v / country_2_of_region_1_for_tp) + ....
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
(sum_countries_all_of_region_1_for_v / sum_countries_all_of_region_1_for_tp)
and then same thing for the other regions (in my case a total of 6 regions).
I have a table of countries with a field country_id and region_id (which specifies to which region this country belongs).
I have the table for the variable with a field country_id, which has kind of a "Excel design", i.e. columns for each year.
And I have a table of regions with a field region_id.
It seems like a rather complicated thing to do, as one needs first to get all the countries of a specific region for both tables (variable & pop_total), have the SUM(of all countries) available and run the mathematical procedure...
Could someone give me a hint how this could be achieved?
Thanks for any help!
Stef