Useful tips for everyday
What is probit transformation? Probit transformation is widely used to transform a probability, percentage, or proportion to a value in the unconstrained interval (−∞,∞), which…
How are new employee hires calculated? Once you’ve determined what period counts for new hire turnover, divide the number of new hires who left within…
How to calculate the sum of two independent gamma random variables? The proof is as follows: (1) Remember that the characteristic function of the sum…
What is a control variable in a model? A control variable is any variable that’s held constant in a research study. It’s not a variable…
How does simple pooling differ from meta-analysis? The purpose of this article is to describe how simple pooling differs from meta-analysis, provide a detailed analysis…
How do you calculate sample size for a study? How to Calculate Sample Size Determine the population size (if known). Determine the confidence interval. Determine…
What is ordinary least squares used for? In statistics, ordinary least squares (OLS) or linear least squares is a method for estimating the unknown parameters…
How do you set margins in R? To visualize how R creates plot margins, look at margin Figure 11.20. You can adjust the size of…
Which is the best type of regression to use? A better solution is piecewise-linear regression, in particular for time series. Logistic regression: Used extensively in…
What is considered a large enough sample size? In practice, some statisticians say that a sample size of 30 is large enough when the population…