what is the bias in the f value selection procedures what is variable selection in ftest is this a mechanical selection procedure when selecting a variable, does it give the model a bias what kind of selection is automatic which procedure gives the greatest bias? do variable selection tests have biases if a variable can be used in an automated selection procedure will the results be compared? do variables automatically select how to select a variable manually can an automated selection give an unbiased result with a f test? how do we do the selection for variables can you get a bias with an automated selection procedure? what is automatic selection and does it give f tests biased results? is mechanical selection bias good can we bias a model by variable selection? can mechanical selection result in bias on f test how does mechanical selection work does t-value autocorrelation have an bias is variable selection automated