Recent content by chipsens

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    different intercept with Multinomial vs Binomial Logistic?

    I have run the same set of Xi on the same data, using both Multinomial and Binomial logistic regression via SPSS. (The outcome in both cases was dichotomous 0/1). They both generate the same coefficients for Bi -- but the Bo value for the Multinomial intercept is different (lower) than for...
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    Creating "score" --> by adding ORs?

    I have created a prognostic model using logistic regression. It predicts diabetes based on 6 independent variables (age, sex BMI, etc). I understand that Exp(Xi) = Odds Ratio of each (risk) factor in the model. I also understand that the probability of diabetes = exp(bo+ bi Xi) /((exp(bo +...
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    Equivalent to RMSE for logistic regression?

    I understand that RMSE is a useful summary measure for assessing predictive power of regression model with continuous dependent Y. Is RMSE equally applicable for logistic regression or is there a better summary measure of predictive power?
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    cross-validation of prognostic model (test-set method)

    I am cross-validating a logistic regression model using the test-set approach, with 70% training data in the test set and 30% in the validation "set" data (random split of 5000 obs). I then wish to compare the predictive power (discrimination) of this model with several other competing models...
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    cross-validation of prognostic model (test-set)

    I am cross-validating a logistic regression model using the test-set approach, with 70% training data in the test set and 30% in the validation "set" data (random split of 5000 obs). then wish to compare the predictive power (discrimination) of this model with several other competing models...