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From |
"Steichen, Thomas J." <SteichT@rjrt.com> |

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

Subject |
st: RE: RE: RE: [programming] syntax syntax |

Date |
Fri, 14 Dec 2007 11:07:27 -0500 |

Thanks for the plug, Al. Interestingly, StataCorp (relatively recently) implemented lots of non-central distribution functions... but not for the t, the one likely needed most frequently! While you can get the two-sided noncentral t p-values from Stata's noncentral F (square the t' and the noncentrality parameter), the one-sided values are not available. This seems like a clear oversight to me. Beyond that, though, the nct package (hopefully) makes it simple to get whichever missing parameter you want. Tom ----------------------------------- Thomas J. Steichen steicht@rjrt.com ----------------------------------- -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Feiveson, Alan H. (JSC-SK311) Sent: Friday, December 14, 2007 10:23 AM To: statalist@hsphsun2.harvard.edu Subject: st: RE: RE: [programming] syntax syntax Thanks very much Tom - Your clear explanations resolve several hours of frustration. By the way, this program (if it ever runs) makes use of your non-central t package. So I'll use this opportunity to put in a plug for it. (ssc describe nct) Al -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Steichen, Thomas J. Sent: Friday, December 14, 2007 9:11 AM To: 'statalist@hsphsun2.harvard.edu' Subject: st: RE: [programming] syntax syntax Al, When you specify an optional option as a real in the syntax statement, you must also specify the default value. For varlist, you can use suboption (default=none) to keep it blank. Then your planned approach will work. For example: syntax [varlist(default=none)] [if] [in] , confdir(string) /// level(real) [ xb1(real 1.0) n1(string) ] Tom ----------------------------------- Thomas J. Steichen steicht@rjrt.com ----------------------------------- -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2..harvard.edu] On Behalf Of Feiveson, Alan H. (JSC-SK311) Sent: Friday, December 14, 2007 9:58 AM To: statalist@hsphsun2.harvard.edu Subject: st: [programming] syntax syntax Hi - I have two questions regarding the syntax of the "syntax" statement: 1) I've been trying to write a program (effcon.ado) that starts with syntax [varlist] [if] [in] , confdir(string) level(real) [xb1(string) n1(string) ] tokenize `varlist' local nv: word count `varlist' di " nv = `nv'" For some reason, this will work only if the "xb1" option is a string, but not if I change it to real: a) output when xb1 is a string in the syntax statement: .. discard .. effcon x1,level(.95) confdir(L) xb1(xyz) n1(asd) nv = 1 [it works, etc.] But if I change the "xb1" option to real, I get a syntax error: b) output when xb1 is real in the syntax statement: .. set trace on .. discard .. effcon x1,level(.95) confdir(L) xb1(1.234) n1(asd) ------------------------------------------------------------------------ -------------- begin effcon --- - version 9.0 - syntax [varlist] [if] [in] , confdir(string) level(real) [xb1(real) n1(string) ] invalid syntax ------------------------------------------------------------------------ ---------------- end effcon --- r(197); 2) My second question deals with the word count of `varlist'. I want to have the option of no variables in varlist. But if I don't list any in my calling statement, `'varlist' is treated as a list of all the variables in my dataset. I thought I could just count the elements in `'varlist' and then do something if that count is zero (i.e. if I don't enter any variables) - but the count comes out 12 (in this case) because I have 12 variables in my data set. Any other suggestions on how to test if I entered any variables in my calling statement? Thanks Al Feiveson 2) Example where I enter no variables but `varlist' contains all my variables: Contains data from temprat.dta obs: 100 vars: 12 13 Dec 2007 08:05 size: 5,200 (99.9% of memory free) ------------------------------------------------------------------------ ------- storage display value variable name type format label variable label ------------------------------------------------------------------------ ------- R float %9.0g C float %9.0g xb1 float %9.0g xb2 float %9.0g s float %9.0g rat float %9.0g rat10 float %9.0g a float %9.0g b float %9.0g n1 float %9.0g x1 float %9.0g x2 float %9.0g ------------------------------------------------------------------------ ------- .. discard .. set trace on .. effcon ,level(.95) confdir(L) ------------------------------------------------------------------------ -------------- begin effcon --- - version 9.0 - syntax [varlist] [if] [in] , confdir(string) level(real) [xb1(string) n1(string) ] - tokenize `varlist' = tokenize R C xb1 xb2 s rat rat10 a b n1 x1 x2 - local nv: word count `varlist' = local nv: word count R C xb1 xb2 s rat rat10 a b n1 x1 x2 - di " nv = `nv'" = di " nv = 12" nv = 12 [rest omitted] * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ ----------------------------------------- CONFIDENTIALITY NOTE: This e-mail message, including any attachment(s), contains information that may be confidential, protected by the attorney-client or other legal privileges, and/or proprietary non-public information. If you are not an intended recipient of this message or an authorized assistant to an intended recipient, please notify the sender by replying to this message and then delete it from your system. Use, dissemination, distribution, or reproduction of this message and/or any of its attachments (if any) by unintended recipients is not authorized and may be unlawful. * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: [programming] syntax syntax***From:*"Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov>

**st: RE: [programming] syntax syntax***From:*"Steichen, Thomas J." <SteichT@rjrt.com>

**st: RE: RE: [programming] syntax syntax***From:*"Feiveson, Alan H. (JSC-SK311)" <alan.h.feiveson@nasa.gov>

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