Summary
Summary Research Methods - Data Analysis I
- Course
- Institution
Summary of 1 pages for the course Research Methods In Psychology at UT
[Show more]
Seller
Followkayleighdebruin1
Reviews received
Content preview
RM | Unit 260 - Non-parametric tests: Spearman’s rho and Kendall’s tauChapter 8: 8.1, 8.2, 8.3, 8.4, 8.5
Chapter 8.1: Introduction
Additivity requires that one unit change in variable X leads to the same amount of change in Y , no matter
what value X has.
Chapter 8.2: Spearman’s ρ (rho)
We could compute an average difference: the average difference is the sum of these differences, divided
by 10, so we get 0. This is because we have both plus and minus values. It would be better to take the
square of the differences so that we would get positive values
This is called the Spearman rank-order correlation coefficient rs, or
Spearman’s rho (the Greek letter ρ). It can be used for any two variables of
which at least one is ordinal. The trick is to convert the scale values into
ranks, and then apply the formula →
Chapter 8.4: Kendall’s rank-order correlation coefficient τ
If you want to study the relationship between two variables, of which at least one is ordinal, you can
either use Spearman’s rs or Kendall’s τ (tau, pronounced ’taw’ as in ’law’). However, if you have three
variables, and you want to know whether there is a relationship between variables A and B, over and
above the effect of variable C, you can use an extension of Kendall’s τ.
We can then fill in the formula to compute Kendall’s τ :
→ τ = agreements − disagreements / totalnumberof pairs = 37 45 = 0.8
This τ -statistic varies between -1 and 1 and can therefore be seen as a nonparametric analogue of
a Pearson correlation
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller kayleighdebruin1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $3.21. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
52510 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now