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st: Questions about xtfrontier and predict
From
"Huerta, Tim" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: Questions about xtfrontier and predict
Date
Thu, 11 Aug 2011 14:59:00 -0500
Hello everyone,
First, thanks in advance for any help you can offer.
Second, I was using xtfrontier to run a cost efficiency model using panel data. I thought everything was going well… However, I ran "predict" to get the technical efficiency and the values aren't what I expected them to be. What am I missing here? Shouldn't CSCE_XTCE_te be less than 1 for the Technical Efficiency?
predict CSCE_XTCE_te, te
predict CSCE_XTCE_u, u
predict CSCE_XTCE_xb, xb
. sum CSCE_XTCE_te CSCE_XTCE_u CSCE_XTCE_xb if CEMatch_SET == 1
Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
CSCE_XTCE_te | 7818 4.871268 1.447222 1.245426 14.91451
CSCE_XTCE_u | 8177 1.548295 .2953062 .2184742 2.694779
CSCE_XTCE_xb | 7818 5.535017 1.038628 2.859497 8.786513
XTFrontier output
. xtfrontier LNNTC LNNPK LNCMAJADM LNVTOT LNADJPD OPDSURG ISHITECH6 COTH MNTEACH $NPKOutInterac $OutputSquares $OutputInterac, tvd cost
Iteration 12: log likelihood = -186.6183
Time-varying decay inefficiency model Number of obs = 7818
Group variable: ID2 Number of groups = 1640
Time variable: DATAYR Obs per group: min = 1
avg = 4.8
max = 5
Wald chi2(17) = 15543.30
Log likelihood = -186.6183 Prob > chi2 = 0.0000
------------------------------------------------------------------------------
LNNTC | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
LNNPK | .1230951 .0424456 2.90 0.004 .0399033 .206287
LNCMAJADM | -.9287228 .0899683 -10.32 0.000 -1.105057 -.7523882
LNVTOT | -.0698187 .0581154 -1.20 0.230 -.1837228 .0440853
LNADJPD | .49232 .0930324 5.29 0.000 .3099799 .6746601
OPDSURG | .3706684 .0735269 5.04 0.000 .2265583 .5147786
ISHITECH6 | .0061135 .0086548 0.71 0.480 -.0108496 .0230766
COTH | .3483112 .0282762 12.32 0.000 .2928909 .4037316
MNTEACH | .0538619 .0071517 7.53 0.000 .0398448 .067879
LNCMAJA~NNPK | .0044411 .0054461 0.82 0.415 -.006233 .0151153
LNVTOT_LNNPK | -.0163276 .0040237 -4.06 0.000 -.0242139 -.0084414
LNADJPD~NNPK | .0085856 .0055698 1.54 0.123 -.002331 .0195022
LNCMAJADM_~M | .0663485 .0079428 8.35 0.000 .0507809 .0819161
LNVTOT_LNV~T | .0521146 .0034643 15.04 0.000 .0453248 .0589044
LNADJPD_LN~D | -.0054209 .0080777 -0.67 0.502 -.0212528 .010411
LNCMAJADM_~T | -.0341653 .0080563 -4.24 0.000 -.0499554 -.0183752
LNCMAJADM_~D | .0548038 .0134572 4.07 0.000 .0284281 .0811795
LNVTOT_LNA~D | -.0541317 .0066951 -8.09 0.000 -.0672539 -.0410096
_cons | 2.70574 .5806837 4.66 0.000 1.567621 3.843859
-------------+----------------------------------------------------------------
/mu | 1.548228 .3881607 3.99 0.000 .7874471 2.309009
/eta | -.0032212 .0012827 -2.51 0.012 -.0057352 -.0007071
/lnsigma2 | -2.040065 .0318383 -64.08 0.000 -2.102467 -1.977663
/ilgtgamma | .973871 .0515536 18.89 0.000 .8728277 1.074914
-------------+----------------------------------------------------------------
sigma2 | .1300203 .0041396 .1221548 .1383923
gamma | .7258904 .0102578 .7053337 .7455304
sigma_u2 | .0943805 .0042113 .0861265 .1026345
sigma_v2 | .0356398 .0006713 .0343241 .0369556
------------------------------------------------------------------------------
Thanks again in advance!
--
Timothy R. Huerta, Ph.D.
Director, Center for Healthcare Innovation, Education and Research
Assistant Professor, Rawls College of Business, Texas Tech University
Texas Tech University
Rawls College of Business
15th and Flint
Lubbock, TX 79409
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