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From |
Matt Roberts <robertsmatt948@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: data structure for clogit |

Date |
Fri, 3 Aug 2012 10:20:13 +0100 |

My Stata programming skills are limited so I am hoping that someone can help me with me. I am conducting some research on government coalitions and I need to create a dataset that contains every possible government that could potentially form after each election. I also need variables that contain information on the total number of seats each potential government would hold in parliament and the ideological range of each government. I have all of the raw data that would be needed to create this dataset, I'm just unsure how to do it in Stata. I could probably do it in Excel but my dataset will exceed the permissable size of an Excel worksheet. Here is a simple example of what I want to achieve: I have the following data for a formation opportunity - the formation opportunity will be the ID variable for the clogit model: Party Seats Ideol P1 40 7 P2 20 2 P3 10 11 Where 'Party' is the name of the individual parties in a parliament, 'Seats' is the share of seats each party has, and 'Ideol' is the ideological position of each party. For the clogit model that I need to use the data must be reconfigured to look like this: ID party_comb tot_seats Ideo_dist 1 P1 40 0 1 P1, P2 60 5 1 P1, P3 50 4 1 P1, P2, P3 70 4 1 P2 20 0 1 P2, P,3 30 9 1 P3 10 0 In the above, 'party_comb' contains every possible government that could form, 'tot_seats' is the total number of seats that each government would hold - this comes from adding the relevant values from the raw data outlined above. 'Ideo_dist' is the distance between the the largest and smallest values of the 'Ideol' variable for the relevant parties; so for the combination 'P1, P2' this is 7-2=5. This is not a problem to hand code with only a few cases but I have quite a lot of cases (200+) and in some the number of potential governments will exceed 2,000. If it makes it any easier, the values for the 'party_comb' variable could be divided into separate cells across the row so that each cell represents one party. Thanks for any help that you can provide with this. Matt * * 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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