Linked Questions

93
votes
1answer
184k views

Correlation between a nominal (IV) and a continuous (DV) variable

I have a nominal variable (different topics of conversation, coded as topic0=0 etc) and a number of scale variables (DV) such as the length of a conversation. How can I derive correlations between ...
4
votes
3answers
11k views

Why compare sum of squares with ANOVA (and not mean)?

I got the following result of a ANOVA analysis of five independent variables with 5,8,2,2,6 levels and 5 replications for each combination: ...
1
vote
2answers
3k views

$\eta^2$ and paired t-tests

When doing a paired t-test, is it appropriate to use the paired t value to calculate $\eta^2$? I ask because it is not appropriate to calculate Cohen's d based on the paired t value. Thanks.
1
vote
1answer
18k views

partial eta squared

Would it please be possible to help me with a statistics query. I have asked for the partial eta squared on the output of a one-way within subjects ANOVA from SPSS and it has given me the value .137. ...
2
votes
1answer
7k views

Cohen's d and multiple comparisons for 2/3-way ANOVA

I am conducting three-way ANOVA (A*B*C) with 2 levels each. 1) I found A*B interaction. 2) I moved to 2-way ANOVA (A*B) and found interaction again. I reported Eta-squared and equivalent Cohen's d. 3) ...
4
votes
3answers
4k views

R² of ANCOVA mostly driven by covariate

Based on data from a scenario-based experiment, I am running a $2\times2\times2$ ANCOVA with one continuous covariate (sample size 320). Without including the covariate, the ANOVA model and two of the ...
1
vote
0answers
11k views

Interpreting F, p, & partial eta squared from an ANOVA

I am trying to interpret data from previous research and I don't understand what the individual statistics (F, p, and np2--partial eta squared) are telling me about the data, or how they relate to ...
3
votes
1answer
5k views

How to calculate 95% confidence intervals for partial eta squared and eta squared?

Following on from this question on reporting eta squared, I would like to report 95% CIs for my effect size point estimates (partial eta and eta squared values). What statistics do I need to know ...
5
votes
1answer
2k views

Is it possible to find non-significant result from one-way ANOVA but significant results from individual post-hoc tests?

I'd like to get some advice on one-way ANOVA analysis with Dunnett's T3 post hoc test. Is it possible to find non-significant result from one-way ANOVA analysis (p=.224), yet find differences in the ...
2
votes
1answer
3k views

Spearman's rho for nominal / metrical data [closed]

Can Spearman's rho be used to calculate correlations between nominal (i.e., locations such as 1 = City1, 2 = City2, 3 = City3) and metrical data (i.e., revenue generated in US dollars)? I also heard ...
2
votes
2answers
1k views

How to obtain a p-value for the eta measure of association?

How can a P-Value be obtained for an analysis of Eta association? Is there a reference for this?
1
vote
0answers
2k views

Definition of Wilk's Lambda in MANOVA and relation to eta squared

I conducted a repeated measures MANOVA with a two-level between-subejcts factor and nine DVs, using SPSS 23. The interaction effect I was interested in was significant. Looking at what SPSS labels to ...
3
votes
1answer
191 views

Can you add up effect sizes of two related variables (e.g. age + age$^2$) from a single regression model?

I am interested in the effect of age on outcome Y. I have two nested linear regression models to test linear and quadratic effects of age: Y= $\beta_0$ + $\beta_1$ some_covariate + $\beta_2$ Age + ...
2
votes
2answers
87 views

I can see my two means are different. What information can a t test add?

Methods such as t-tests and anova find the difference between two means using a statistical method. This seems strange to a beginner like me, one could simply find the mean of two groups and ...
0
votes
0answers
128 views

How to correlate scale and nominal variables in SPSS? [duplicate]

I want to run a test in order to identify if there is any correlation between the length of in-hospital stay (Scale) and the kind of the procedure (Nominal with three options; abdominal, cardiac and ...