stepwise logistic regression using statistics toolbox

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Boyi Jiang 2015
Boyi Jiang 2015 2015-8-14
评论： the cyclist 2015-8-15
The response y in "stepwiseglm" has to be one column vector?
I found that the response y in "glmfit" can be two column matrix with the first column indicating the number of successes for each observation and the second column indicating the number of trials for each observation.
My response y is in format [successes; num of trials] and I want to use "stepwiseglm". How can I do that? Thank you so much!
Boyi

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the cyclist
the cyclist 2015-8-14
编辑：the cyclist 2015-8-14
You can specify the response variable y as a two-column vector, just as you did in glmfit. You must also then specify a binomial distribution, by adding the name-value pair like this ...
stepwiseglm(...,'Distribution','Binomial')
This is mentioned in the documentation for stepwiseglm.
  2 个评论
Boyi Jiang 2015
Boyi Jiang 2015 2015-8-14
Thank you so much! One further question: once I obtained the model, how can I use "[X,Y] = perfcurve(labels,scores,posclass) " to create the ROC curve? Since the response has two colunms: [successes; num of trials]. How to create the "labels"?
the cyclist
the cyclist 2015-8-15
I don't know. You might want to post this as a new question, to get more visibility.

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