I'm new to JMP (version 16.1). I'm running a binomial logisitic regression model. I have the model output set to include parameter estimates and odds ratios. When I take the logodds from the parameter estimates and exponentiate them in Excel in order to obtain the odds ratios, they don't match the odds ratio output in JMP.
My parameter estimates shows that confidence limits are Wald based, and under Odds Ratios it says that tests and confidence intervals are Wald based as well.
Does anyone have any insight as to why my calculations differ from JMPs? How does JMP calculate the odds ratios?
Example:
JMP Output:
Term | Estimate | Std Error | ChiSquare | Prob>ChiSq | Lower 95% | Upper 95% |
Intercept | 2.460656 | 1.570863 | 2.45 | 0.1172 | -0.61818 | 5.539491 |
Age | -0.03287 | 0.021537 | 2.33 | 0.127 | -0.07508 | 0.009342 |
Sex[Female] | -0.05266 | 0.234692 | 0.05 | 0.8225 | -0.51265 | 0.407328 |
BMI | -0.0674 | 0.042016 | 2.57 | 0.1087 | -0.14975 | 0.014951 |
Speed | -0.01883 | 0.017697 | 1.13 | 0.2874 | -0.05351 | 0.015859 |
Restraint All[None] | -0.43613 | 0.269435 | 2.62 | 0.1055 | -0.96422 | 0.09195 |
My Odds Ratio Calculations:
Term | Estimate | Odds Ratio |
Intercept | 2.460656 | 11.71249 |
Age | -0.03287 | 0.967665 |
Sex[Female] | -0.05266 | 0.948703 |
BMI | -0.0674 | 0.934823 |
Speed | -0.01883 | 0.98135 |
Restraint All[None] | -0.43613 | 0.646532 |
JMP's Odds Ratios
Unit Odds Ratios | | | | |
Term | Odds Ratio | Lower 95% | Upper 95% | Reciprocal |
Age | 0.967665 | 0.927669 | 1.009386 | 1.033415 |
BMI | 0.934823 | 0.860925 | 1.015063 | 1.069722 |
Speed | 0.98135 | 0.947896 | 1.015985 | 1.019004 |
Range Odds Ratios | | | | |
Term | Odds Ratio | Lower 95% | Upper 95% | Reciprocal |
Age | 0.235452 | 0.036752 | 1.508409 | 4.247151 |
BMI | 0.073658 | 0.003042 | 1.783541 | 13.57625 |
Speed | 0.183722 | 0.008099 | 4.167436 | 5.443015 |
Odds Ratios for Sex | | | | | |
Level1 | /Level2 | Odds Ratio | Prob>Chisq | Lower 95% | Upper 95% |
Male | Female | 1.111064 | 0.8225 | 0.442791 | 2.787911 |
Female | Male | 0.900038 | 0.8225 | 0.358692 | 2.2584 |
Odds Ratios for Restraint All | | | | | |
Level1 | /Level2 | Odds Ratio | Prob>Chisq | Lower 95% | Upper 95% |
Seatbelt | None | 2.392325 | 0.1055 | 0.832019 | 6.878711 |
None | Seatbelt | 0.418004 | 0.1055 | 0.145376 | 1.201896 |
Thanks in advance!