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From |
Nick Cox <njcoxstata@gmail.com> |

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

Subject |
Re: programming syntax problem [was: Re: st: From: "Christopher L. Aberson" ...] |

Date |
Tue, 18 Jun 2013 01:01:03 +0100 |

Look again at your line simulate _b _se, reps(100): powersim3 -powersim3- has compulsory options but you don't supply them. Nick njcoxstata@gmail.com On 18 June 2013 00:39, Christopher L. Aberson <Christopher.Aberson@humboldt.edu> wrote: > Not sure I follow you. If I run this without using the single command line > approach (i.e., just plug in numbers I want here) the Simulate command is > getting fed. > > clear all > program define powersim3 > drop _all > matrix r = (1.0,.30,.30\.30,1.0,.30\.30,.30,1.0) > matrix m = (0,0,0) > matrix sd = (1,1,1) > drawnorm y x1 x2, n(282) corr(r) means(m) sds(sd) > > regress y x1 x2 > end > > simulate _b _se, reps(100): powersim3 > > Yet when I try to execute this using a command line as shown in the previous > posts, simulate isn't getting fed. > > Can you clarify how I can tweak the original code to make this run? > > > <You are using -simulate- to call your -powersim3-, but not feeding it > anything. > <Nick > <njcoxstata@gmail.com > > > On 17 June 2013 21:56, Christopher L. Aberson > <Christopher.Aberson@humboldt.edu> wrote: >> Thank you for the feedback. The approaches suggested made the code >> more elegant but did not solve the core issue. >> >> To recap, I wand to run the code noted below (encased in *****) using >> this line powersim3, ry1(.30) ry2(.30) r12 (.30) n (282) >> that defines the required characteristics. >> >> It appears the issue is that the simulate command isn't recognizing >> the powersim3 command above. I expect there is a simple solution here >> -- but I'm not proficient enough in Stata to know what the simple >> answer is. Any additional suggestions would be very helpful. >> >> ****** >> program define powersim3, rclass >> syntax, ry1(real)ry2(real)r12(real)n( >> real) [my(real 0)m1(real >> 0)m2(real 0)m3(real 0)sy(real 1) /// >> s1(real 1)s2(real 1)s3(real 1)alpha(real .05)help] >> matrix m = (`my', `m1', `m2') >> matrix sd = (`sy', `s1', `s2') >> matrix r = (1, `ry1', `ry2'\ `ry1' , 1 , `r12'\ `ry2' , `r12', 1) >> drawnorm y x1 x2, n(`n') corr(r) means(m) sds(sd) >> regress y x1 x2 >> end >> >> simulate _b _se, reps(10000): powersim3 >> ***** >> >> >>> Please use meaningful titles for your postings. >>> >>> Try editing out the spaces between option names and option details in >>> the cases of the options >>> >>> ry1 (real) ry2 (real) r12 (real) sy (real 1) s1 (real 1) s2 (real 1) >>> s3 (real 1) >>> >>> Incidentally, your program does nothing with the options >>> >>> alpha(real .05) help >>> >>> although you may be planning to add details later. >>> >>> Nick >>> njcoxstata@gmail.com >>> >>> >>> On 14 June 2013 23:18, <owner-statalist@hsphsun2.harvard.edu> wrote: >>>> I've written a tiny program for simulation of multiple regression >>>> results. I can run this on a line by line basis (using actual values >>>> instead of the syntax command), but when I put it in an ado, it >>>> doesn't work. >>>> >>>> The basic idea is use drawnorm to generate a dataset, run regression >>>> on it, then do it over and over using the simulate option. >>>> >>>> >>>> program define powersim3, rclass >>>> syntax, ry1 (real) ry2 (real) r12 (real) [my(real 0) m1(real 0) >>>> m2(real 0) m3(real 0)] [sy (real 1) /// >>>> s1 (real 1) s2 (real 1) s3 (real 1)] n(real) [alpha(real .05) help ] >>>> matrix m = (`my', `m1', `m2') >>>> matrix sd = (`sy', `s1', `s2') >>>> matrix r = (1, `ry1', `ry2'\ `ry1' , 1 , `r12'\ `ry2' , `r12', 1) >>>> drawnorm y x1 x2, n(`n') corr(r) means(m) sds(sd) >>>> regress y x1 x2 >>>> end >>>> >>>> simulate _b _se, reps(10000): powersim3 >>>> >>>> .powersim3, ry1(.30) ry2(.30) r12 (.30) n (282) >>>> >>>> This yields an error saying "ry1" required. If I take out the simulate >>>> command I get a single regression but not the repeated >>>> sampling/simulation I want. * * 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/

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