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From |
qing ye <yeqing1013@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Thu, 8 Dec 2011 06:34:10 +0800 |

hi, I just tried the collapse, it is really handy, it is amazing how stata create so powerful commend. I guess my old way of programming in VB is very narrow and restricted. But I still wanted to know if there is anyway that I could store the results I calculated in the loop as a table? Do I need to use matrix related commend? The following is the code: forvalues i=1990 (1)2010 { 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' } } How do I make stata to memorize the mean_EI_BE value that is calculated after each loop , and at then end report all the mean_EI_BE as a seperate table? Best Qing On 8 December 2011 03:17, Nick Cox <n.j.cox@durham.ac.uk> wrote: > 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/ * * 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: 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>

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

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