Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
| From | Shuaizhang Feng <shuaizhang.feng@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: bootstrap weighted mean |
| Date | Thu, 3 Oct 2013 09:25:41 +0800 |
Dear all: thanks a lot for all the replies. It turned out that - set trace on was tremendously helpful. After I drop ",detail" the code works fine. many thanks for other suggestions too. SZ On Wed, Oct 2, 2013 at 7:49 PM, Stas Kolenikov <skolenik@gmail.com> wrote: > So why exactly do you want to do this? This is Stata's -ratio- > command, and what you are doing is achievable with -bootstrap : > ratio-. If you need to incorporate weights, you can use -bsweights- / > -bs4rw- combo (the first is mine, the second is Jeff Pitblado's). > > -- Stas Kolenikov, PhD, PStat (ASA, SSC) > -- Senior Survey Statistician, Abt SRBI > -- Opinions stated in this email are mine only, and do not reflect the > position of my employer > -- http://stas.kolenikov.name > > > > On Tue, Oct 1, 2013 at 9:40 PM, Shuaizhang Feng > <shuaizhang.feng@gmail.com> wrote: >> Dear list: >> >> I was trying to bootstrap standard errors for the mean of two >> variables. When I do so for simple means, i use the following ado >> file. >> >> program myratio, rclass >> summarize `1' >> local a1 = r(mean) >> summarize `2' >> local a2 = r(mean) >> return scalar ratio = `a1'/`a2' >> end >> >> and then do the following: >> >> .bootstrap r(ratio), reps(100) saving(cratio, replace): myratio u1 u2, detail >> >> and this gives the results as expected. >> >> however, when i wanted to do ratio of weighted means, i modified the >> ado file as follows: >> >> program myratio_w, rclass >> summarize `1'[iw=`3'] >> local a1 = r(mean) >> summarize `2'[iw=`3'] >> local a2 = r(mean) >> return scalar ratio = `a1'/`a2' >> end >> >> >> and then use: >> >> bootstrap r(ratio), reps(100) saving(cratio, replace): myratio_w u1 u2 >> weight, detail >> >> then stata does not work properly and gives me the following message: >> >> invalid syntax >> an error occurred when bootstrap executed myratio_w >> r(198); >> >> >> I am wondering if anyone from the list can help me out. the difference >> between the two ado files seem small Thanks in advance. >> >> SZ >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/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/faqs/resources/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/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/