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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 08:14:42 +0100 |

If you look again at the help for -simulate- the main example is a program with options. The -simulate- call shows that program being called with arguments for its options. No option calls are given in your -simulate- call. This seems especially important as you have required options in -powersim3-. How is -powersim3- supposed to operate then? For my part, I don't understand why this basic point is not clear to you. If this doesn't help, or I in turn am misunderstanding, sorry, but I end there. Nick njcoxstata@gmail.com On 18 June 2013 05:11, Christopher L. Aberson <Christopher.Aberson@humboldt.edu> wrote: > Respectfully -- I don't understand what needs to be supplied. That's > why I've been posting here. No matter how many times you say "look at > this or that" I'm not going to be able to figure this out on my own. > That is why I am seeking help. > > > >>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/

**Follow-Ups**:**Re: programming syntax problem [was: Re: st: From: "Christopher L. Aberson" ...]***From:*Nick Cox <njcoxstata@gmail.com>

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