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From |
Guy Grossman <[email protected]> |

To |
[email protected] |

Subject |
st: Data management: lowest value for which some condition is met |

Date |
Sat, 30 Oct 2010 22:35:57 -0400 |

Dear list members, I would appreciate your help in what seems like a non complicated task, but unfortunately I am failing to find a simple solution. I have a dataset such as the following: each group (1:G) plays a game for several rounds (1:R), and each round has values of the variable x (10, 20, 30, 40). Z is an indicator variable that can be 0 or 1. My goal is to create a new variable Q, that measures for each group and round the lowest value of x for which z==0. for example for group 1 in round 1 20 is the lowest x for which z=0, so Q is assigned the value 20 for all group==1 and round==1. In group 1 round 3, the lowest value of x for which z=0 is 30, etc. I am hoping to get suggestions for a Stata code that can generate Q efficiently, for a large dataset. Many thanks! Guy group round x z Q 1 1 10 1 20 1 1 20 0 20 1 1 30 0 20 1 1 40 0 20 1 2 10 1 40 1 2 20 1 40 1 2 30 1 40 1 2 40 0 40 1 3 10 1 30 1 3 20 1 30 1 3 30 0 30 1 3 40 0 30 2 1 10 0 10 2 1 20 0 10 2 1 30 0 10 2 1 40 0 10 2 2 10 1 30 2 2 20 1 30 2 2 30 0 30 2 2 40 0 30 2 3 10 1 40 2 3 20 1 40 2 3 30 1 40 2 3 40 0 40 * * 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/

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