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2009 Oct 10
1
many weighted means: is there a simpler way?
Hi R-users, I would like to calculate weighted mean of several variables by two factors where the weight vector is the same for all variables. Below, there is a simple example where I have only two variables: "v1","v2" both weighted by "wt" and my factors are "gender" and "year". set.seed(1) df <- data.frame(gender = rep(c("M",
2008 Apr 10
1
Degrees of freedom in binomial glm
...oc, family = binomial, data = satdata, weights = Freq) Deviance Residuals: Min 1Q Median 3Q Max -19.456 -6.839 0.000 6.309 17.635 Coefficients: Estimate Std. Error z value Pr(>|z|) (Intercept) 0.334265 0.056491 5.917 3.28e-09 *** genderF -0.180480 0.047575 -3.794 0.000149 *** age35-44 0.122422 0.051836 2.362 0.018191 * age>44 0.361610 0.051576 7.011 2.36e-12 *** raceOther -0.005883 0.061605 -0.095 0.923919 locMidAtl 0.437342 0.103821 4.212 2.53e-05 *** locS 0.178574 0.073033...