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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
st: AW: RE: AW: RE: RE: reshape command ---listing all the variables changing over time? |

Date |
Fri, 14 May 2010 13:27:40 +0200 |

<> " I can't see where that's promised or implied." Amanda`s post did keep me busy last night due to this slight inconsistency in the help file. If you let Stata ************* reshape wide x, i(id) j(j) ************* in my example, it complains: x ambiguous abbreviation r(111); So that points to the expansion of a -varlist-, as in *** clear foreach var of newlist x1-x5{ gen `var'=2 } unab mylocal: x *** All of which the help file does not make clear. Still, the variable names thus passed to Stata are actually used as "stubs" for the wide form dataset: . reshape wide x1-x5, i(id) j(j) (note: j = 1 2 3) Data long -> wide ---------------------------------------------------------------------------- - Number of obs. 300 -> 100 Number of variables 12 -> 21 j variable (3 values) j -> (dropped) xij variables: x1 -> x11 x12 x13 x2 -> x21 x22 x23 x3 -> x31 x32 x33 x4 -> x41 x42 x43 x5 -> x51 x52 x53 ---------------------------------------------------------------------------- - HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Nick Cox Gesendet: Freitag, 14. Mai 2010 13:15 An: statalist@hsphsun2.harvard.edu Betreff: st: RE: AW: RE: RE: reshape command ---listing all the variables changing over time? Good point. I was replying directly to Amanda. But in your example and hers, I expected the stubs to be -x-. Bu in fact they are not. It's interesting that -reshape- in parsing a list of stubs will expand a varlist. I can't see where that's promised or implied. I certainly hadn't appreciated it before. Nick n.j.cox@durham.ac.uk Martin Weiss " In addition, your -reshape- example is puzzling." Actually, this was the _one_ aspect that I did not find strange about this post. Which aspect of thie following example do you find puzzling? ************* clear* set obs 100 gen byte id=_n expand 3 bys id: gen byte j=_n foreach var of newlist x1-x5{ //time varying vars gen `var'=rnormal() } foreach var of newlist y1-y5{ //constant vars gen `var'=5 } reshape wide x1-x5, i(id) j(j) ************* HTH Martin -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Nick Cox Gesendet: Freitag, 14. Mai 2010 12:57 An: statalist@hsphsun2.harvard.edu Betreff: st: RE: RE: reshape command ---listing all the variables changing over time? In addition, your -reshape- example is puzzling. -reshape- expects stubs, not variable names. Nick n.j.cox@durham.ac.uk Nick Cox In addition to other replies findname, all(@ == @[1]) finds all variables which are constant; adding its -not- option finds the complement. You can specify a varlist too to separate constant and changing variables. The syntax catches numeric and string variables alike. -findname- is a user-written program from SSC. Amanda Fu I was wondering if anyone could help me with a problem I met when using --reshape--command. When I tried to reshape a data set from long version to wide version, I find I need to list all the variables that are not constant in the --reshape--command. Suppose the data set has 1500 variables changing over time and 100 constant variables. ------------------------------------------------------------ . reshape wide x1-x1500, i(id) j(wave) ------------------------------------------------------------ If I miss any of the variables changing over time, the reshape command will give error message such as "variable XXXX not constant " and will stop working. But it is so frustrating to separate the constant variables and not-constant variables and list all of the latter ones in the reshape command. What I used to do is just to drop all the unnecessary variables from the data set before reshape to reduce the work load here. May I know if there is any more efficient way to deal with this problem? * * 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/

**Follow-Ups**:**st: AW: AW: RE: AW: RE: RE: reshape command ---listing all the variables changing over time?***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**References**:**st:reshape command ---listing all the variables changing over time?***From:*Amanda Fu <mandy.fu1@gmail.com>

**st: RE: reshape command ---listing all the variables changing over time?***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**st: RE: RE: reshape command ---listing all the variables changing over time?***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**st: AW: RE: RE: reshape command ---listing all the variables changing over time?***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**st: RE: AW: RE: RE: reshape command ---listing all the variables changing over time?***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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