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From |
"I.A.C. van de Snepscheut" <Inez.vandeSnepscheut@student.uva.nl> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: Re: st: RE: RE: Changes of the dataset |

Date |
Wed, 05 Oct 2005 14:12:46 +0200 |

You understood my problem very well the first time, your output was exactly what I wanted to have. Only I made my example a litte bit simpler with less variables. You must think of the same situation only the variables are not only price colour age id and buyer, but also a couple of other variables (in total something like 30 variables). I put all my variables between the brackets after i (just like you did) and than stata gave an error. The number of variabeles is too high. Than I tried and the maximum number of variables appeared to be 10, so that is a problem. Now my question was do you have a solution for this problem? Inez ----- Original Message ----- From: n j cox <n.j.cox@durham.ac.uk> Date: Wednesday, October 5, 2005 1:26 pm Subject: Re: Re: st: RE: RE: Changes of the dataset > Sorry, I thought that I understood what your problem was. > Now that you have changed the problem to this vaguer > one I don't have a clear enough picture to advise, except > in a backwards manner: if your data don't allow a -reshape- > solution, that may not really be a good idea. > > It seems entirely possible that your original data structure > may in fact be best overall for what you want to do. You > just need to get fluent with -by:-, -collapse- and some other > commands. > > Nick > n.j.cox@durham.ac.uk > > I.A.C. van de Snepscheut > > Hi Nick > > Thanx for your quick reaction. But now I have the following > problem: I > have too many variables. The maximum in this command is 10 and I have > many more variables. Can I do it a number of times? > > Nick Cox > > > > This looks like a -reshape- to me. > > > > > > . l > > > > > > +-----------------------------------+ > > > | buyer price colour age id | > > > |-----------------------------------| > > > 1. | X 10 Yellow 12 1 | > > > 2. | X 10 Red 16 2 | > > > 3. | Y 12 Red 16 2 | > > > 4. | Z 13 Red 16 2 | > > > 5. | Z 15 Blue 4 3 | > > > |-----------------------------------| > > > 6. | Y 80 Green 1 4 | > > > 7. | H 6 White 20 5 | > > > 8. | H 10 White 20 5 | > > > 9. | X 14 Red 16 2 | > > > +-----------------------------------+ > > > > > > . gen newid = _n > > > > > > . reshape wide price, i(newid id colour age) j(buyer) string > > > (note: j = H X Y Z) > > > > > > Data long -> wide > > > -------------------------------------------------------------- > > > --------------- > > > Number of obs. 9 -> 9 > > > Number of variables 6 -> 8 > > > j variable (4 values) buyer -> (dropped) > > > xij variables: > > > price -> priceH priceX > > > ... priceZ > > > -------------------------------------------------------------- > > > --------------- > > > > > > . renpfix price > > > > > > . drop newid > > > > > > . l > > > > > > +---------------------------------------+ > > > | colour age id H X Y Z | > > > |---------------------------------------| > > > 1. | Yellow 12 1 . 10 . . | > > > 2. | Red 16 2 . 10 . . | > > > 3. | Red 16 2 . . 12 . | > > > 4. | Red 16 2 . . . 13 | > > > 5. | Blue 4 3 . . . 15 | > > > |---------------------------------------| > > > 6. | Green 1 4 . . 80 . | > > > 7. | White 20 5 6 . . . | > > > 8. | White 20 5 10 . . . | > > > 9. | Red 16 2 . 14 . . | > > > +---------------------------------------+ > > > > > > See [D] reshape and the FAQ on reshape. > > > > > > Nick > > > n.j.cox@durham.ac.uk > > * > * 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/

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