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    Logistic regression

    My sample size is 250. Also would the sample size affect how I do my regression model ? I can put them all in the model but my question is these categorical variables the have more than 2 categories, should I create a dummy variables for them and all minus one in the model of just put them as...
  2. N

    Logistic regression

    Hi guys, I am a little noob in statistics and I need your help to run a logistic regression in SPSS for the data that I have. I have a dichotomous outcome: final vision 20/60 or better and final vision <20/60 vision. The other variables that I want to fit in the model is: Age: scale Sex...