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From |
Suryadipta Roy <sroy2138@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Calculating average value using STATA program language |

Date |
Mon, 12 Sep 2011 10:28:31 -0400 |

Nick, Thank you! I am sure that Stata has other ways (like using -foreach- etc.) to arrive at the solution, and as Phil has suggested, probably it was a good exercise in the long run for me to check out the manuals. I am sure that I need to do lot more of that. I was actually trying something like the follwing: gen double avg=. qui levelsof importer, local(clist) foreach i of local clist { su import if importer=="`i'", meanonly qui replace avg=r(mean) if exporter=="`i'" } However, I understood that this is not going to work, since I did not know a way to incorporate the industry categories (isic) in the program. To sum it up, I clearly understand that I need to devote a lot more time on the manuals, and the related materials to understand Stata programming. Sincerely, Suryadipta. On Mon, Sep 12, 2011 at 4:21 AM, Nick Cox <njcoxstata@gmail.com> wrote: > Suryadipta got excellent advice to look at -collapse- and the problem > appears to be solved. However, if the main problem really had been > misunderstanding of loops, it would have been hard to advise on the > precise misunderstanding, as no Stata commands were included in this > post. Saying exactly what you typed and what then happened is another > key piece of advice. > > Nick > > On Mon, Sep 12, 2011 at 4:47 AM, Suryadipta Roy <sroy2138@gmail.com> wrote: > >> I am a newbie in terms of writing Stata codes, and intend to get that >> corrected pretty soon. Meanwhile, I was wondering if any one could >> help me with the following. I have been trying use foreach/forvalues >> without any success for some time. Any help/suggestion/hint is greatly >> appreciated. >> >> importer exporter year isic imports sum_import avg_import >> AUS FRA 1979 311 8 24 12 >> AUS FRA 1980 311 16 24 12 >> AUS FRA 1979 313 0 0 0 >> AUS FRA 1980 313 0 0 0 >> AUS GAB 1979 369 0 0 0 >> AUS GBR 1976 311 10 30 10 >> AUS GBR 1977 311 20 30 10 >> AUS GBR 1978 311 0 30 10 >> AUT CAN 1977 312 10 10 10 >> AUT CAN 1978 390 20 20 20 >> FRA AUS 1976 311 5 10 5 >> FRA AUS 1977 311 5 10 5 >> FRA AUT 1980 369 4 4 4 >> >> In the hypothetical dataset above, I am trying to create the last two >> columns (sum_import, and avg_import) from the "imports" column. For >> the first column, the idea is to calculate the sum of imports e.g. >> from FRA to AUS for each industry category (isic). Thus for the isic >> category 311, the sum of imports in 1979 and 1980 is 8 + 16 = 24, and >> the average in the two years is 12. Similarly, there were no trade >> between AUS and GAB in 1979 for the industry category 369, and hence >> the sum and the average value of imports = 0. The actual dataset has >> over 200 countries covering data from 1976 - 1980 and I am trying to >> calculate the average of the imports between 1976- 1980 in each >> industry category. There are 28 such industry categories. >> > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Calculating average value using STATA program language***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: Calculating average value using STATA program language***From:*Suryadipta Roy <sroy2138@gmail.com>

**Re: st: Calculating average value using STATA program language***From:*Nick Cox <njcoxstata@gmail.com>

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