Beginner Statistics
Hypothesis Testing
How to Perform the Wilcoxon Signed Rank Test
The Wilcoxon Signed Rank Test is the non-parametric version of the paired t-test. It is used to test whether or not there is a significant difference...
Chi-Square Tests
Three Ways to Calculate Effect Size for a Chi-Square Test
In statistics, there are two commonly used Chi-Square tests:
Chi-Square Test for Goodness of Fit: Used to determine whether or not a categorical variable follows a...
P-values and Effect Size
How to Calculate a P-Value from a T-Test By Hand
One of the most common tests used in statistics is the t-test, which is often used to determine if a population mean is equal to some...
Regression
How to Calculate Residuals in Regression Analysis
Simple linear regression is a statistical method you can use to understand the relationship between two variables, x and y.
One variable, x, is known as...
Regression
How to Interpret Regression Coefficients
In statistics, regression analysis is a technique that can be used to analyze the relationship between predictor variables and a response variable.
When you use software (like...
P-values and Effect Size
Effect Size: What It Is and Why It Matters
“Statistical significance is the least interesting thing about the results. You should describe the results in terms of measures of magnitude – not just,...
Regression
A Simple Guide to Understanding the F-Test of Overall Significance in Regression
This tutorial explains how to identify the F-statistic in the output of a regression table as well as how to interpret this statistic and...
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