user1205901 - Reinstate Monica
  • Member for 9 years, 11 months
  • Last seen this week
Do points with high Cook's distance necessarily have a high standardized residual, and vice-versa?
6 votes

1. A data point can still be considered influential if it has a large Cook's Distance, even if it has a low standardized residual. The following image (taken from p214 of Andy Field’s Discovering ...

View answer
Why is RMSEA typically reported with a 90% confidence interval, and not 95%?
Accepted answer
4 votes

Curran et al. (2003) write that: It is common to report 90 percent confidence intervals for the RMSEA, primarily because of the resulting direct link to hypothesis testing based on the model ...

View answer
How should I interpret the generalized squared multiple correlation?
Accepted answer
3 votes

Although as far as I can tell the 3rd edition of Schumacker & Lomax doesn't answer my question, the 4th edition (from 2015) does! Quoting p84 of that text (but changing the figure to match my data)...

View answer
What's the difference between including a variable as a mediator in a mediation analysis, and including a variable as a covariate in ANCOVA?
Accepted answer
2 votes

The difference is that in mediation the predictor X is theorized to cause Y, and this causal effect is theorized to depend (in whole, or substantially) via X causing the mediator M which in turn ...

View answer
Mediation analysis: When does the total effect exactly equal direct effect + indirect effect?
Accepted answer
2 votes

David Kenny writes on his website that: The equation of c = c' + ab exactly holds when a) multiple regression (or structural equation modeling without latent variables) is used, b) the same ...

View answer
How can there be a standard deviation of true scores?
2 votes

I've found an answer, although not one that I find particularly satisfying. Here on p9 of the book "Handbook of Psychological and Educational Assessment of Children it is written: "The standard ...

View answer
Is high ICC essential when using HLM?
1 votes

Nezlek (2008) on p.857 puts forward a case that analysts should use multilevel modeling when they have a multilevel data structure – pure and simple. When I am asked for advice regarding whether or ...

View answer
Why doesn’t a $F$-statistic of 1 result in a $p$-value of about 0.5?
0 votes

Point ‘1’ is basically OK. If the ANOVA null hypothesis is true, the expected value of $p$ is $0.5$, and @BruceET’s answer helps to build intuitions about why that is the case. “About $1$” is a ...

View answer
How to calculate the Doolittle Skill Score?
Accepted answer
0 votes

Armistead (2016) provides the solution, which is that the score - which he calls Doolittle’s $i_1$ - should in fact be rendered as $\frac{(ad-bc)^2}{(a+b)(a+c)(b+d)(c+d)}$ Armistead explains on p.65 ...

View answer
Any suggestions for a good undergraduate introductory textbook to statistics?
0 votes

I have been a TA, observer, or student in a lot of courses involving quantitative methods for psychology, with SPSS as the main program. In all cases it has seemed to me that students have gravitated ...

View answer