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From |
Nick Cox <n.j.cox@durham.ac.uk> |

To |
"'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: RE: how to store the statistics calculated in a loop as a table? |

Date |
Wed, 7 Dec 2011 19:17:03 +0000 |

We can only respond to what you explain. In principle -collapse- can be extended to much more complicated problems. You need to try it, not to speculate. Did you try my code? Once you have a dataset of summary statistics, the problem of tabulation largely disappears. Again, if you start looking at the documentation carefully and apply the commands, this will become clearer. Nick n.j.cox@durham.ac.uk qing ye Hi, Nick Thanks for the information. Actually, I will want to calculate several statsitics using that loop. in addition, I will want to based on the group+year, calculate some statistics for the group-year over the next few periods. for example, I have a group in 1990, then I want to calculate some statistcs for stocks in the group over the next 12 months, so the code I provided was my first attempt to do start with something simple. I guess the collapse will not work if I want to include all the statistics calculated for each group at each period in a panel-format table? So how do I exactly can store the statistics I calculated in a loop into one cell of a table? I used to do this kind of analysis in VB, which is strictforward, after each loop, I store the value into one cell of an arrany, and I have no idea how do I do that in stata, not even a clue on what kind of commends I should use. Best Qing On 8 December 2011 02:39, Nick Cox <n.j.cox@durham.ac.uk> wrote: > -collapse- in particular should mean that you do not need to loop at all. > > You can calculate all the ratios of sums by a single -generate-. > > collapse (sum) s_EI = EI_t (sum) s_BE = BE_t_1 if inrange(trade_date_yearformat, 1990, 2010), by(FF_group_rank_0 trade_date_yearformat) > > gen mean_EI_BE = s_EI / s_BE > > Nick > n.j.cox@durham.ac.uk > > qing ye > > hi, I have checked collapse and tabstat, still no ideas about how to > use it combined with a loop? > > In the loop, everytime, I calculated one mean_EI_BE, how do I write > this one result into one cell of a table where the columns and rows of > the table reprsents different steps in a looping? > > On 8 December 2011 02:08, qing ye <yeqing1013@gmail.com> wrote: > >> Thanks for the quick reply. >> >> I will check the help file for collapse and tabstat >> >> the group takes the value of 1-6, and the varible FF_group_rank_0 >> takes values of 1-6 stating six groups, so I want to loop for each >> group, I guess I need to use forvalues rather than foreach? > > On 8 December 2011 02:00, Nick Cox <n.j.cox@durham.ac.uk> wrote: > >>> I'd look at -collapse- and/or -tabstat-. >>> >>> In any case, your loop >>> >>> foreach group of varlist FF_group_rank_0 { >>> >>> } >>> >>> will do nothing as `group' is never referred to inside the loop. That probably doesn't matter, but it shows some confusion about what -foreach- does. > > qing ye > >>> Do any of you know how to report the results calculated after the loop >>> as tables?? >>> >>> forvalues i=1990 (1)2010 { >>> foreach group of varlist FF_group_rank_0 { >>> forvalues n=1(1)6{ >>> >>> >>> quietly sum EI_t if >>> trade_date_yearformat==`i' &FF_group_rank_0==`n' >>> local s_EI=r(sum) >>> quietly sum BE_t_1 if >>> trade_date_yearformat==`i' &FF_group_rank_0==`n' >>> local s_BE=r(sum) >>> local mean_EI_BE=`s_EI'/`s_BE' >>> >>> >>> } >>> } >>> } >>> >>> I wanted to have the mean_EI_BE I calculated in the loops reported as a table >>> >>> something like the following: >>> >>> year group1 group2 group3 group4 group5 group6 >>> >>> 1990 x x x >>> 1991 x x x >>> 1992 x x x >>> 1993 x x x >>> .... >>> >>> >>> >>> How do I do this? Do I need to use matrix commends to save the >>> mean_EI_BE I calculated each time or do I need to generate some >>> variables before the loop and store the mean_EI_BE in those variables? > > * > * 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/ * * 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: RE: how to store the statistics calculated in a loop as a table?***From:*qing ye <yeqing1013@gmail.com>

**References**:**st: how to store the statistics calculated in a loop as a table?***From:*qing ye <yeqing1013@gmail.com>

**st: RE: how to store the statistics calculated in a loop as a table?***From:*Nick Cox <n.j.cox@durham.ac.uk>

**Re: st: RE: how to store the statistics calculated in a loop as a table?***From:*qing ye <yeqing1013@gmail.com>

**Re: st: RE: how to store the statistics calculated in a loop as a table?***From:*qing ye <yeqing1013@gmail.com>

**RE: st: RE: how to store the statistics calculated in a loop as a table?***From:*Nick Cox <n.j.cox@durham.ac.uk>

**Re: st: RE: how to store the statistics calculated in a loop as a table?***From:*qing ye <yeqing1013@gmail.com>

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