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From |
"Joseph Coveney" <jcoveney@bigplanet.com> |

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

Subject |
Re: st: Reshape limit |

Date |
Fri, 7 Nov 2008 01:00:56 +0900 |

Ashim Kapoor wrote: Re: st: Reshape limit -------------------------------------------------------------------------------- Ashim Kapoor wrote: I have 3 variables value , j1 and j2. j1 goes from 1 to 3 j2 goes from 1 to 10032 and the data is in long form. When I say reshape wide value,i(j1) j(j2) Stata says that I have too many values for j2. saying -help limits- or -help reshape- does not enlighten me. can someone point me in the right direction ? -------------------------------------------------------------------------------- If you haven't done so already, be sure to -set maxvars- to what you'll need. I don't know whether -reshape- has a limit smaller than 32767 variables, but if so then you can do the reshape in batches, each of which individually is small enough for -reshape- to handle, assembling the pieces with -merge-. The do-file below shows how it's done. Pardon the use of magic numbers. Joseph Coveney clear * set more off set maxvar 32767 // Create dummy dataset for illustration set obs 10032 generate byte j1 = . generate int j2 = _n generate float value = runiform() tempfile dataset save `dataset', emptyok replace j1 = 1 forvalues j1 = 2/3 { append using `dataset' replace j1 = `j1' if missing(j1) } // Reshape in small batches sort j2 save `dataset', replace tempfile Accumulator local last_N 0 local first_pass 1 quietly forvalues this_N = 1881(1881)30096 { use `dataset' keep in `=`last_N' + 1' / `this_N' local last_N `this_N' reshape wide value, i(j1) j(j2) if (`first_pass') { save `Accumulator' local first_pass 0 } else { sort j1 merge j1 using `Accumulator' assert _merge == 3 drop _merge sort j1 save `Accumulator', replace } } use `Accumulator', clear exit * * 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**:**Re: st: Reshape limit***From:*"Friedrich Huebler" <fhuebler@gmail.com>

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