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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

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

Subject |
st: RE: tokenize `varlist' error? |

Date |
Fri, 23 Apr 2004 16:55:56 +0100 |

-tokenize- doesn't understand the varlist idea. It just splits text that it is fed according to white space (in this case), or specified parsing characters, subject to binding by double quotes or compound double quotes. One way of proceeding in your case is a prior -unab- (I am ignoring one stray "_" as a possible typo) unab varlist : `varlist' tokenize `varlist' while "`1'" ~= "" { generate a1997`1'=0 replace a1997`1'=1 if `1'==1997 generate a1998`1'=0 replace a1998`1'=1 if `1'==1998 macro shift } But you can avoid all this by using -foreach- to cycle through your varlist. local varlist p26_1_1-p26_1_3 foreach v of var `varlist' { generate a1997`v'=0 replace a1997`v'=1 if `v'==1997 generate a1998`v'=0 replace a1998`v'=1 if `v'==1998 } The local is redundant: foreach v of var p26_1_1-p26_1_3 { generate a1997`v'=0 replace a1997`v'=1 if `v'==1997 generate a1998`v'=0 replace a1998`v'=1 if `v'==1998 } and the inside can be condensed foreach v of var p26_1_1-p26_1_3 { generate a1997`v' = `v' == 1997 generate a1998`v' = `v' == 1998 } For more background, see the paper "How to face lists with fortitude" in SJ 2(2) 2002 (or Google to get internet copies of earlier version). Nick n.j.cox@durham.ac.uk Adrian Gonzalez-Gonzalez I want to perform a simple procedure over 100 variables and I don't want to enter the name of each variable one by one. If I use the first definition of varlist (below), my little procedure works fine. But if I used the second definition of varlist, using "-" I get an error (procedure below). How can I solve this problem? I am sure this is very simple for most of you, but I am new trying to do these things with Stata. My version is 7.0 updated. Thanks a lot Adrian local varlist p26_1_1 p26_1_2 p26_1_3 local varlist p26_1_1-p26_1_3 tokenize `varlist' while "`1'" ~= "" { 2. generate a1997`1'_=0 3. replace a1997`1'=1 if `1'==1997 4. generate a1998`1'=0 5. replace a1998`1'=1 if `1'==1998 6. macro shift 7. } invalid syntax r(198); end of do-file r(198); * * 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/

**Follow-Ups**:**st: RE: RE: tokenize `varlist' error?***From:*Adrian Gonzalez-Gonzalez <gonzalez-gonzale.1@osu.edu>

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