Author: Will
Correlation Analysis in SPSS
This tutorial shows how you can do correlation analysis in SPSS. Correlation is a statistical measure of the relationship between two variables, X and Y. The typical situation of using correlation analysis is when both X and Y are continuous...
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SPSS Measure: Nominal, Ordinal, and Scale
This tutorial provides definitions and examples for the 3 SPSS measures, including nominal, ordinal, and scale. 1. Definitions for Nominal, Ordinal, and Scale Nominal Data Variables at the nominal level are categorical and have no inherent order or numerical meaning....
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How to Interpret Interaction Effects in Linear Regression (4 Steps)
This tutorial shows how to interpret interaction effects in linear regression models. In summary, there are two perspectives, (a) mean difference perspective and (b) slope difference perspective. Interpret Interaction Effect in Linear Regression (a) Mean Difference Perspective: One way to...
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How to Plot 2-Way ANOVA Interaction in R (with Example)
This tutorial shows how to plot the figure for the interaction in 2-way ANOVA in R. Steps of Plotting 2-Way ANOVA Interaction in R Step 1: Prepare the data The following is the data being used for the examples. It...
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How to Fix: Data must be 1-dimensional
You might encounter the following error when trying to convert Numpy arrays to a pandas dataframe. Exception: Data must be 1-dimensional 1. Reproduce the Error Output: Exception: Data must be 1-dimensional 2. Why the Error Happens It happens because pd.DataFrame...
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What is Linear Regression Model? Definition and Example
1. Definition of Linear Regression Model Multiple linear regression is a linear model accessing the relationship between a dependent variable (DV, or Y) and multiple intendent variables (IV, or X). For instance, you might want to test how consumer purchase...
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Two sample t-test: Definition, formula, and Examples
Two sample t-test is also called independent sample t-test or unpaired sample t-test. This tutorial explains what two sample t-test is, its formula, and examples of two sample t-test. Motivation Example Imagine that a researcher is interested in determining whether...
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Correlation: Definition, Formula, and Examples
1. What is Correlation? Correlation is a statistical measure of the relationship between two variables, X and Y. For instance, you can measure to what extent temperature (X) is related to the production of ice cream (Y). You probably would...
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What is the Difference between Independent and Paired Sample t-test
This tutorial explains what t-test is, and the difference between independent sample t-test (or two sample t-test) and paired sample t-test. It also explains what two-sample and one-sample t-test are. 1. What is independent sample t-test? Indepdent sample t-test examines...
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