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Table 1 Comparison of marginal effects of Tobit, Tweedie, Poisson, and two-part (Binomial/Gamma and Binomial/GenG) models on the RAND HIE data

From: Tweedie distributions for fitting semicontinuous health care utilization cost data

  Tobit Tweedie Poisson Two-part  
        Binomial Gamma GenG
  Est. SE Est. SE Est. SE Est. SE Est. SE Est. SE
Intercept -212.276 118.391 883.966 112.936 94.892 94.754 -0.091 0.050 1260.155 132.253 861.167 66.452
age 2.274 1.135 1.481 1.067 1.064 0.934 0.002 0.001 1.083 1.222 1.652 0.606
disea 6.319 1.695 3.045 1.566 3.534 1.408 0.005 0.001 2.127 1.806 5.664 0.895
physlm 214.712 34.484 143.054 31.272 191.965 28.998 0.040 0.019 168.177 36.817 118.515 18.349
logc -23.994 17.530 -9.577 16.520 -8.445 13.323 -0.023 0.008 -3.963 19.191 -19.759 9.494
idp -7.057 34.130 10.661 32.162 -3.311 27.925 -0.008 0.016 14.492 37.642 26.614 18.545
lpi -1.806 5.612 -5.907 5.251 -1.625 4.612 0.001 0.003 -7.198 6.087 -4.135 3.005
fmde 1.728 10.453 3.828 9.846 -0.086 8.550 0.001 0.005 4.595 11.310 0.862 5.614
linc 18.113 11.951 13.757 11.492 6.876 9.452 0.012 0.005 8.076 13.893 13.392 6.926
lfam -12.640 23.245 -2.754 21.955 -15.670 18.987 0.007 0.011 -1.910 25.514 -22.502 12.599
female 138.240 26.417 82.600 25.001 66.654 21.586 0.116 0.013 68.471 28.453 71.842 14.100
black -166.908 39.181 -72.274 37.161 -60.124 31.299 -0.129 0.016 -28.317 44.221 -85.676 22.035
educdec 0.150 4.556 -2.301 4.290 -2.869 3.736 0.005 0.002 -4.205 4.897 1.894 2.441
hlthg -17.324 25.583 -13.963 24.077 -23.013 20.990 0.013 0.012 -20.765 27.486 -18.554 13.627
p    1.719     2   2  
AIC 43649 37777 51495 2770 34482 33439
RMSE (5-CV) 573.26 568.14 572.33   568.60 568.23  
  1. p is the estimated mean-variance power parameter