Tomasz Rak

4 Questions 42 Answers 0 Followers

Questions related from Tomasz Rak

Non-equal variances t-test in SPSS - it's Welch or Cochran-Cox?

Can anyone help me answer the question of whether t test for unequal variances is calculated in SPSS according to Welch or Cochran-Cox correction? Test statistics are the same, they differ only...

05 May 2019 4,045 12 View

Is there any reason why one can not reduce dimensions with PCA/Alpha before putting them into SEM model?

Suppose I have three measurable variables (A, B, C on figure below) and one latent (L) in my SEM model. This one latent one is a construct/dimension consisting of 5 questions from some...

04 April 2019 7,191 7 View

Why collinearity can reverse predictor sign in regression?

It is understandable to me that such a problem arises when highly correlated predictors are entered into regression equation. At this point, predictor sign changes to opposite to correlation...

10 October 2017 2,665 1 View

In APA style should we report degrees of freedom for Spearman's rank correlation?

In APA 6.0 manual there is information (pp 113) about reporting degrees of freedom for Pearson correlation coefficient - and for parametric correlation it is sugested to report df's. But what...

04 April 2017 9,496 2 View