[R] Logistic regression

Annie Bissonnette a.bissonnette at aim.uzh.ch
Wed Sep 24 10:04:29 CEST 2008


Dear all,

I am currently learning to run logistic regression models with R. Would 
someone tell me what this exactly means:

Estimated scale (compare to 1 ) 1.746724

If the value is higher or lower than 1, what should I do?

The complete results of the model were as follows:
Generalized linear mixed model fit using Laplace
Formula: success ~ diffca + (1 | partner1) + (1 | partner2) + (1 | target)
    Data: cascoresept08.df
  Family: binomial(logit link)
    AIC BIC logLik deviance
  105.8 121.8 -47.89 95.79
Random effects:
  Groups Name Variance Std.Dev.
  partner1 (Intercept) 5.0000e-10 2.2361e-05
  partner2 (Intercept) 5.0000e-10 2.2361e-05
  target (Intercept) 1.0461e+00 1.0228e+00
number of obs: 182, groups: partner1, 19; partner2, 19; target, 13

Estimated scale (compare to 1 ) 1.746724

Fixed effects:
             Estimate Std. Error z value Pr(>|z|)
(Intercept) -4.5053 0.9174 -4.911 9.06e-07 ***
diffca 0.7631 0.1130 6.756 1.42e-11 ***

I thank you in advance!

Annie



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