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Welcome
 Welcome to Inferential Statistics with R
 Introduction to the Dataset

ttests
 Independent ttest
 Dependent ttest

OneWay ANOVA
 OneWay ANOVA
 Post Hoc Comparisons
 Other ANOVA Tests

ChiSquare
 ChiSquare
 Dealing with Small Cells

Correlation
 Correlation

Regression
 Linear Regression
 Multiple Regression
 Hierarchical Regression

Reliability
 Reliability

Reporting Results
 Extracting Output
 Reporting Results

Testing Assumptions
 Testing Assumptions
 Testing for Normality
 Testing for Homogeneity of Variance
 Violated Assumptions
Inferential Statistics with R
Reliability
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This lesson is called Reliability, part of the Inferential Statistics with R course. This lesson is called Reliability, part of the Inferential Statistics with R course.
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Transcript
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Your Turn
Perform a test of internal consistency using both omega and alpha on the SWLS scale at time 2.
Does the scale have good internal consistency at time 2, as well?
Learn More
Read more about the omega() and alpha() functions in the psych package.
The Personality Project also has a great tutorial on Using R and the psych package to find omega.
Interested in learning more about why it may be preferential to use omega instead of alpha? Check out the article "Thanks coefficient alpha, we'll take it from here " by McNeish (2018). Use this link to download the unformatted open access version of the article.
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Maria Cristina Limlingan
January 14, 2022
Thanks for sharing about omega  this is good information to know. I'm wondering if you suggestions about how to do inter rater reliability between two people in R? (e.g. 2 people doing an observation and want to find out if they are coding similarly)