Useful tips for everyday
How does instrumental variable work? The idea behind instrumental variables is that the changes in treatment that are caused by the instrument are unconfounded (since…
What will happens if residuals are not normally distributed? When these don’t show up in your data it’s going to ‘fail’ the normality tests. So…
Should I normalize data for correlation? Popular Answers (1) No no need to standardize. Because by definition the correlation coefficient is independent of change of…
Is Mann-Whitney U test of difference? The Mann-Whitney U test is used to compare differences between two independent groups when the dependent variable is either…
What are the different design options for clinical trials? Common clinical trial designs include single-arm trials, placebo-controlled trials, crossover trials, factorial trials, noninferiority trials, and…
When does a lad model have a unique solution? When a unique solution does exist, then the LAD model has the desirable property that if…
What does the Wilcoxon rank sum test do? The Wilcoxon test is a nonparametric statistical test that compares two paired groups, and comes in two…
What are the problems with predicting a dichotomous dependent variable using OLS? The reasons why OLS cannot be used for a dichotomous dependent variable is…
How can I check the correlation between features and target variable? The following correlation output should list all the variables and their correlations to the…
How do you find the correlation between factors? To calculate the Pearson product-moment correlation, one must first determine the covariance of the two variables in…