Which of the following can be used to validate a regression

Which of the following can be used to validate a regression model

1- Analysis of the model coefficients and predicted values including comparisons with prior experience, physical theory, and other analytical models or simulation results

2- Collection of new data to investigate the model\'s predictive performance

3-Data splitting, that is, setting aside some of the original data and using these observations to investigate the model\'s predictiveperformance

4- All the above

Solution

THE ANSWER IS

4 ALL THE ABOVE