# How to Plot a t Distribution in R

To plot the probability density function for a t distribution in R, we can use the following functions: dt(x, df) to create the probability density function…

# How to Perform a Durbin-Watson Test in R

One of the key assumptions in linear regression is that there is no correlation between the residuals, e.g. the residuals are independent. One way to…

# How to Perform Hierarchical Regression in Stata

Hierarchical regression is a technique we can use to compare several different linear models. The basic idea is that we first fit a linear regression model…

# How to Perform a Repeated Measures ANOVA in Excel

A repeated measures ANOVA is used to determine whether or not there is a statistically significant difference between the means of three or more groups in which…

# How to Perform Levene’s Test in Excel

Levene’s Test is used to determine whether two or more groups have equal variances. This is a widely used test in statistics because many statistical tests…

# How to Perform a Kruskal-Wallis Test in Excel

A Kruskal-Wallis Test is used to determine whether or not there is a statistically significant difference between the medians of three or more independent groups.…

# How to Perform the Friedman Test in Excel

The Friedman Test is a non-parametric alternative to the Repeated Measures ANOVA. It is used to determine whether or not there is a statistically significant difference between the means of…

# How to Create a Double Doughnut Chart in Excel

A doughnut chart is a circular chart that uses “slices” to display the relative sizes of data. It’s similar to a pie chart except it has a…

# How to Calculate Odds Ratio and Relative Risk in Excel

We often use the odds ratio and relative risk when performing an analysis on a 2-by-2 table, which takes on the following format: The odds ratio tells us the ratio of…

# How to Create and Interpret Box Plots in Excel

A box plot is a type of plot that we can use to visualize the five number summary of a dataset, which includes: The minimum The first…