Useful tips for everyday
How to test hypothesis of two population proportions? A hypothesis test for the difference of two population proportions requires that the following conditions are met:…
What does it mean if the standard error is higher than the coefficient? There is not necessarily a problem if the standard error is greater…
Is the default correlation of nlme : LME null? I just noticed that the default correlation of nlme::lme () is NULL. The explanation of argument…
How can I increase my AUC? One possible alternative (depending on your classification technique) is to use class weights instead using sampling techniques. Adding a…
When is PCA a valid method of feature selection? The only way PCA is a valid method of feature selection is if the most important…
What is cumulative effect? : an effect produced by something happening over a long period of time the cumulative effect(s) of smoking on the body.…
How is an effect size measure different from a statistical test? Effect size helps readers understand the magnitude of differences found, whereas statistical significance examines…
Can we get different results for different runs of K-means clustering A? K-Means clustering algorithm instead converses on local minima which might also correspond to…
What is the leverage value in multiple regression? Leverage: An observation with high leverage will pull the regression line towards it. The average leverage score…
What is effect size in Wilcoxon signed rank test? Also for the paired case (Wilcoxon signed-rank), I recommend against using the z/sqrt(N) approach. According to…