[amelia] Exceptionally high degrees of freedom

Hello, I applied Amelia II to multiply impute missings in our survey data. I used AmeliaView and the imputation was successful, so Amelia generated five sets of multiply imputed data in Stata (dta) format (that I had chosen). After the multiple imputation I conducted a few sets of regression analyses using "Clarify" to combine the results across the five multiply imputed data. The analyses also worked well,the coefficients all make sense (they correspond with the other analyses we have done using "observed" data) but a problem is some of the analyses sometimes yielded exceptionally high degrees of freedom for some variables. I don't know why I got this inflated degrees of freedom because all procedures went well without any error messages (not every variables but some of the variables included yielded high degrees of freedom). For your information, I didn't have any other problems other than this. With regard to this, I emailed to Matt and was advised to use Zelig for data analysis (and I will try to do that) but still wonder about these generally high degrees of freedom issue. I attached the some of the results from our analysis below (sorry about very-long variable name, it tracks our record of changes), so if any of you can give us any reasons for this, it will be greatly appreciated !!! Thanks a lot! *Model 4 estsimp ologit Academic_Rank female_excludes_missing Minority_excludes_missing MarriedPartnered childrennumber_excluding_missng /// Partner_employed_fulltime ProgramRankReversed YearsToDegree_b Q18Specified_1a Overalladvise /// Q24a_1 Joint_appt_exclude_missing Private_Instit_excluding_missng PHD_program_excluding_missing MA_program_excluding_missing /// CurrentDepartmentRank Overallresource Released_from_teaching Age, /// mi(Amelia_07081 Amelia_07082 Amelia_07083 Amelia_07084 Amelia_07085) Ologit estimates (via multiple imputation) Nobs = 1274 --------------------------------------------------------------- Academic_Rank | Coef. Std. Err. t d.f. P>|t| ---------+----------------------------------------------------- female~g | -.3274721 .166179 -1.971 46 0.055 Minori~g | -.2167513 .2327173 -0.931 21 0.362 Marrie~d | .1626777 .2992682 0.544 13 0.596 childr~g | -.0014547 .0611694 -0.024 1369 0.981 Partne~e | .1729933 .1713316 1.010 66 0.316 Progra~d | .0937531 .0533029 1.759 737 0.079 YearsT~b | -.1231956 .0332016 -3.711 326 0.000 Q18Sp~1a | -.031667 .0363591 -0.871 140 0.385 Overa~se | .255504 .1046298 2.442 391 0.015 Q24a_1 | .3497809 .0661697 5.286 107 0.000 Joint_~g | .240031 .2157427 1.113 884 0.266 Privat~g | .1729383 .1528752 1.131 1393 0.258 PHD_pr~g | -.4210008 .2339427 -1.800 450 0.073 MA_pro~g | -.5302672 .1984522 -2.672 228 0.008 Curren~k | .0081537 .0687515 0.119 962 0.906 Overa~ce | .0831138 .0275379 3.018 227 0.003 Releas~g | .1378443 .0192077 7.177 8560 0.000 Age | .1728987 .0092188 18.755 107 0.000 _cut1 | 7.459078 .5828492 12.798 175 0.000 _cut2 | 9.781068 .6282563 15.569 175 0.000 --------------------------------------------------------------- Number of simulations : 1000 Names of new variables : b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 b16 b17 b18 b19 b20 Datasets used for MI : Amelia_07081 Amelia_07082 Amelia_07083 Amelia_07084 Amelia_07085 Lee, Jaemook The University of Iowa Ph.D Candidate Department of Political Science Iowa City, Iowa,