Useful tips for everyday
How many subjects are needed for a repeated measures design? Further sample size reductions are possible because each subject is involved with multiple treatments. For…
Is OLS consistent with heteroskedasticity? We use OLS (inefficient but) consistent estimators, and calculate an alternative (“robust”) standard error that allows for the possibility of…
Can a hurdle model predict the mean count? The hurdle model will always predict the same number of zeros as we observed. We can also…
How an optimal cut off probability can be computed in logistic regression model? Reference line: intersection point at which there is a balance between sensitivity…
Is Ward method agglomerative clustering? In statistics, Ward’s method is a criterion applied in hierarchical cluster analysis. Ward suggested a general agglomerative hierarchical clustering procedure,…
How to build a parametric regression model in survival? The survreg () function contained in survival package is able to fit parametric regression model. Let’s…
How do you find the probability of a biased coin? 3 Answers P(A|B)=P(B|A)P(A)P(B) You want to know the probability of P(biased coin|three heads). With a…
What does the within-subjects comparison in a mixed model ANOVA do? A mixed ANOVA compares the mean differences between groups that have been split on…
Should you standardize test data? Yes you need to apply normalisation to test data, if your algorithm works with or needs normalised training data*. That…
What happens when we fail to reject the null hypothesis? When we reject the null hypothesis when the null hypothesis is true. When we fail…