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From |
Klaus Pforr <kpforr@googlemail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: panel data with irregular intervals |

Date |
Tue, 10 Jul 2012 14:41:24 +0200 |

<> dear problem-haver, for this serious case of meta-humor I brought myself to comment on this post. This is a hard question to answer generally. You could use a panel data model, where your "time points" are the problems within each problem solver with fixed or random problem-solver effects. The command for this could be <xtreg score time_taken indep_vars, fe> (with <xtset solver> before). Your data would be in sofar unbalanced as you would have different number of problems for each solver. Note, that having a variable that measures time does not automatically imply, that you have a panel model over this time variable. And vice versa, a panel data model does not need a time variable but firstly a clustered data structure. Therefore, having time as an independent variable, which obviously varies across problems and solvers, does not mean, that you have an unbalanced panel data set. It is unbalanced, because you have 4 problems for solver B and 3 problems for solver A and C. best Klaus Pforr __________________________________ Klaus Pforr GESIS -- Leibniz Institut für Sozialwissenschaft B2,1 Postfach 122155 D - 68072 Mannheim Tel: +49 621 1246 298 Fax: +49 621 1246 100 E-Mail: klaus.pforr@gesis.org __________________________________ -----Ursprüngliche Nachricht----- Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von MunHeejin Gesendet: Dienstag, 10. Juli 2012 08:43 An: statalist@hsphsun2.harvard.edu Betreff: st: panel data with irregular intervals Good day, statalisters. I have data of problem-solving contests. During a contest, solvers 'irregularly' submit solutions, and then receive scores of the solutions. The data set of a contest is as follows: Solver Time Score Time_Taken Independent_Var1 Independent_Var2 A 1 20 1 0.5 0.7 A 4 30 3 0.7 0.8 A 5 50 1 0.2 0.1 B 3 10 3 0.5 0.2 B 7 15 4 0.7 0.6 B 8 20 1 0.2 0.4 B 10 25 2 0.1 0.5 C 1 20 1 0.8 0.9 C 4 30 3 0.5 0.2 In my opinion, general regression techniques may be not able to estimate the effects of independent variables on Score and Time_Taken due to extremely unbalanced data set. How can I estimate the effects of independent variables on Score and Time_Taken? Many thanks. * * 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/ * * 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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