Hypothesis Tests in R

A pooled standard deviation is simply a weighted average of standard deviations from two or more independent groups. In statistics it appears…

You can use the following basic syntax to calculate the standard deviation of columns in R: #calculate standard deviation of one column…

A hypothesis test is a formal statistical test we use to reject or fail to reject some statistical hypothesis. This tutorial explains…

The weighted standard deviation is a useful way to measure the dispersion of values in a dataset when some values in the…

In statistics, pooled variance refers to the average of two or more group variances. We use the word “pooled” to indicate that…

 A log rank test is the most common way to compare survival curves between two groups. This test uses the following hypotheses:…

Bartlett’s test is a statistical test that is used to determine whether or not the variances between several groups are equal. Many…

The Granger Causality test is used to determine whether or not one time series is useful for forecasting another. This test uses…

A Chow test is used to test whether the coefficients in two different regression models on different datasets are equal. This test is typically…

A coefficient of variation, often abbreviated as CV, is a way to measure how spread out values are in a dataset relative…