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,...
Tutorials
What is a Representative Sample and Why is it Important?
In statistics, we’re often interested in studying characteristics of specific populations. For example, we might be interested in studying:
The overall job satisfaction of mechanical...
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...
Tutorials
Levels of Measurement: Nominal, Ordinal, Interval and Ratio
In statistics, we use data to answer interesting questions. But not all data is created equal. There are actually four different data measurement scales that...
ANOVA
A Guide to Using Post Hoc Tests with ANOVA
An ANOVA is a statistical test that is used to determine whether or not there is a statistically significant difference between the means of...
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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