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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 |
Tue, 13 Sep 2011 06:43:25 -0400 |

Nick, Thank you for the suggestions! While -collapse- took care of my needs for now, I really need to keep working on this for long term benefits. Sincerely, Suryadipta. On Mon, Sep 12, 2011 at 11:11 AM, Nick Cox <njcoxstata@gmail.com> wrote: > In your example, -exporter- probably means -importer-. > > Otherwise, this is a very reasonable example of using a loop. > > It is, however, not needed as > > egen avg = mean(import), by(importer) > > gets you there in one. > > I don't know how you want to take account of -isic-, but you could do this too > > egen avg = mean(import), by(importer isic) > > Nick > > On Mon, Sep 12, 2011 at 3:28 PM, Suryadipta Roy <sroy2138@gmail.com> wrote: >> 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/

**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>

**Re: 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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