I need to calculate the positive predictive value for a validation set for a rare event. The problem is that the validation set was oversampled for the rare event. The event occurs in 5 percent of the ...
I have data from 12 users, and want to perform cross-validation. Is it necessary that I create my training and test data from different users, or can all of the data be randomized, and then split into ...
In logistic regression, does the lack of significance of the parameter estimates in a test sample indicate overfitting?
I am trying to build a logistic regression model where I have a dependent variable $y$ and independent variables $x_1$, $x_2$... $x_n$. $y$ can take only two values - 0 or 1. My original modelling ...
What are the statistical techniques to create a sample set, which is representative of the entire population (with a known confidence level)? Also, How to validate, if the sample fits the overall ...