Prudence Butler

5 Questions 6 Answers 0 Followers

Questions related from Prudence Butler

What method/s can I use to determine acceptable LoA when using the Bland Altman method for looking at test retest reliability?

- I’m looking at evaluating level of agreement b/w 2 scores taken from the same person, 2 wks apart - I have produced a bland-Altman plot. Mean differences b/w scores normally distributed - as...

09 March 2022 6,789 0 View

If a measure is unidimensional, will PCA and EFA produce similar/same results?

Is it fair to compare findings from studies where one study has used PCA and the other EFA when the measure is unidimensional?

02 February 2022 4,427 7 View

Polychoric correlations: how do you manage missing response categories?

I am running an EFA on an 8-item questionnaire. Each item can be rated between 0 and 10, with higher scores = more negative/worse relative to lower scores. Sample size is small at n=81. I am...

20 December 2021 6,946 4 View

To test convergent validity, should you look at simple correlations between measures, or use regression?

-My sample size is small at n=80 -Measure under investigation has 8 items -I have scores for three related measures that were completed at the same time as the measure of interest -I have a set of...

20 October 2021 2,053 8 View

Sample size logistic regression unequal groups

Seeking to clarify my understanding of determinants of minimal sample size for logistic regression. I am looking at predictors of worry after injury. There are n=120 people in the ‘not worried’...

01 January 1970 1,815 4 View