st: Re: help with loops

["Robert Ndugwa" <robert.ndugwa@urz.uni-heidelberg.de>]

Dear Stata users,

I have a data set that looks like below. I want to graph a series of plots 
where i plot on the same scatter the score by on several available dates for 
the same person id. I need individual graphs for each Id. But i dont have a 
continous running ID as some IDs are exlcuded due to no entries.
For example i dont have entries for ID=6 here so i dont need any graph for 
this.

How can i make the program only to plot where ID exists?
by current program looks like this

local i=1

while `i'<=20 {

twoway (scatter score date if id==`i' & class=="AA", legend(label(1 "AA") 
label(2 "BB")) ytitle("id"`i')) (scatter score date if id==`i' & 
class=="BB" )

graph save child_`i'.wmf

local i=`i' + 1

}



   +-----------------------------------+

     |  id      date     score    class |

     |-----------------------------------|

  1. |   1   28 May 04      146     AA |

  2. |   1   28 May 04      120     AA |

  3. |   1   11 Mar 04       92     AA |

  4. |   1   11 Mar 04      175     BB |

  5. |   1   11 Mar 04      149     AA |

     |-----------------------------------|

  6. |   1   28 May 04      123     AA |

  7. |   2   09 Jan 04      163     BB |

  8. |   2   25 May 04      126     AA |

  9. |   3   05 Feb 04      166     BB |

 10. |   3   10 Jun 04      155     AA |

     |-----------------------------------|

 11. |   3   05 Feb 04      206     BB |

 12. |   4   04 Mar 04      123     AA |

 13. |   5   03 Jun 04      136     AA |

 14. |   5   03 Jun 04      146     AA |

 15. |   5   09 Jun 04      146     AA |

     |-----------------------------------|

 16. |   5   09 Jun 04      123     AA |

 17. |   5   03 Jun 04      185     BB |

 18. |   5   04 Mar 04      110     AA |

 19. |   5   08 Mar 04      120     AA |

 20. |   7   04 Mar 04      120     AA |

     |-----------------------------------|

 21. |   8   02 Mar 04      194     BB |

 22. |  11   29 Dec 03      139     AA |

 23. |  11   08 Mar 04      139     AA |

 24. |  11   08 Mar 04      149     AA |

 25. |  12   27 Feb 04      160     BB |

     |-----------------------------------|

 26. |  12   05 Feb 04      158     AA |

 27. |  12   04 Mar 04       92     AA |

 28. |  12   27 Feb 04      149     AA |

 29. |  12   05 Feb 04      194     BB |

 30. |  13   04 Mar 04      166     BB |

     |-----------------------------------|

 31. |  13   04 Mar 04      123     AA |

 32. |  15   04 Mar 04      146     AA |

 33. |  15   28 May 04      149     AA |

 34. |  16   25 May 04      136     AA |

 35. |  16   31 May 04      158     AA |

     |-----------------------------------|

 36. |  17   10 Mar 04      175     BB |

 37. |  17   10 Mar 04      146     AA |

 38. |  19   10 Jun 04      191     BB |






Thank you all in advance



Robert



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