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From |
Alberto R Osella <arosella@irccsdebellis.it> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: Loop question |

Date |
Tue, 08 Feb 2011 11:19:00 +0100 |

Thank you again. Alberto Alberto R. Osella, MD, PhD Laboratorio di Epidemiologia e Biostatistica IRCCS Saverio de Bellis Via Turi, 27 70013 Castellana Grotte (BA) Italia Tel: +39 0804994655 Fax: +39 0804994650 e-mail: arosella@irccsdebellis.it Il 08/02/2011 11:06, Nick Cox ha scritto:

Strictly, I don't know that P_B4_cut is a variable. It might be a variable; it might be a scalar; it might not exist. There is no way to tell from this posting. But whatever the story, -xtile- won't run because it needs a varname. Nick n.j.cox@durham.ac.uk Nick Cox Stata is telling you the problem. It is nothing to do with the loop as such, but a problem with the syntax of -xtile-. The -cutpoint()- option expects a variable. P_R1 - P_B4_cut is not a variable; it is an expression, specifically the difference between two variables. Therefore, you must create a variable holding this difference before you enter the loop. Alberto R Osella after a factor analysis (pca) I'd want to create categorical variables by using a loop. But I have some troubles. Here the code I'm using predict P_R1 P_R2 P_R3 P_R4, regression predict P_B1 P_B2 P_B3 P_B4, bartlett foreach x of var P_R1-P_B4 { pctile q_`x'_c= `x' if caso_ctrol0==0& P_R1-P_B4<., nq(5) tab2 `x' caso_ctrol0 xtile `x'_q=`x', cutpoint( P_R1-P_B4_cut) tab2 `x'_q caso_ctrol0 } and this is the error: variable P_B4_cut not found in option cutpoints() r(111) I'm using Stata 11.1 on windows 7. * * 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: Loop question***From:*Alberto R Osella <arosella@irccsdebellis.it>

**st: RE: Loop question***From:*Nick Cox <n.j.cox@durham.ac.uk>

**st: RE: Loop question***From:*Nick Cox <n.j.cox@durham.ac.uk>

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