20 Questions 31 Answers 0 Followers
Questions related from Jari Metsämuuronen
Dear colleagues working with effect sizes, I’m studying the relation of Cohen’s d and Cohen’s f. See the appended file of my problem. In short: Cohen f and d are strictly related in the case of...
25 January 2024 5,752 11 View
Dear colleages, Eta squared is dominantly used in reflecting the explaining power the same manner as a squared partial correlation coefficient (R2p ) from multiple linear regression: as the...
23 February 2021 8,299 3 View
Hi you, the expert of measurement modeling! The classical measurement model that is used in estimating reliability by, for example, maximal reliability, do not include any element for the...
16 September 2020 2,391 3 View
Hi all, I'm having some theroretical ponderings with polytomous items and item-total correlation. In the binary case, we have a modification of Pearson correlation of the item X and scale...
07 March 2018 5,035 2 View
This post is more or less an open discussion type of guestion. While writing the Essentials of Research Methods in Human Sciences (SAGE, 2017) I noted that absolutely most research methods...
28 January 2017 9,159 7 View
Hi all,It is easy to show that the reliability of the MEAN score is the same as that of SUM score but I have not found any article/source of that. If you know such an article/source, please, send...
01 January 1970 2,864 5 View
Dear colleagues, As the traditional t-test statistics (T) is strictly related to point biserial coefficient of correlation (RPB), and because RPB is prone to give estimates that are radically...
01 January 1970 7,487 4 View
Dear (younger) colleagues, Usually, in the textbooks and handbooks it is claimed that the commonly used Pearson correlation is a symmetric measure for correlation because it produces only one...
01 January 1970 5,597 1 View
Dear collegues! Many of us know that the traditional product-moment coefficient of correlation (PMC, "Pearson correlation") gives radically deflated (or attenuated) estimates of association when...
01 January 1970 6,951 0 View
Dear colleagues working with effect sizes, I'm not sure whether I created something already created before me. Anyhow, I derived several general formulae for Cohen's d which can be used fo...
01 January 1970 3,085 0 View
Recently, an article was published in Frontiers in Psychology of deflation-corrected estimators of reliability (Deflation-Corrected Estimators of Reliability ). It has been reported that in some...
01 January 1970 5,933 0 View
Dear colleagues, Earlier I noticed that the traditional t-test statistic seems to give too low estimates. Now I noticed the same with F-test statistic: The estimates by the traditional F-tests...
01 January 1970 9,732 1 View
Dear colleague working with effect sizes! For your use (and entertainment, maybe) I developed formulae for r effect size, Cohen's d and Cohen's f that transform the estimate to the metrics of a...
01 January 1970 9,325 0 View
Dear colleague working with product-moment correlation, that is, dear all of you! Transforming properly an estimate of product-moment correlation (r) to the scale of Cohen’s d is important when...
01 January 1970 3,641 0 View
Dear colleagues in the research community, As we know, there are two approaches to hypothesis testing of cross-tables: testing for independence and testing for correlation between variables. In...
01 January 1970 1,472 6 View
Dear colleagues, Choice reaction time (CRT) is a central concept in brain research, and we study it at the Turku Research Institute for Learning Analytics (TRILA), for example in the analysis of...
01 January 1970 9,617 0 View
Dear colleagues, Just to add some fuel in the discussion of understimation of reliability, Applied Psychological Measurement published just an article discussing of the attenuation and deflation...
01 January 1970 816 0 View
Dear colleagues, I have been in understanding that IRT estimators of reliability are (somehow) more accurate than the classical estimators. As a surprise, after simple simulations with my...
01 January 1970 8,116 4 View
Dear colleagues working with item analysis and test construction! With my colleagues, we came up with some pretty awsome new formulae related to item-test and item-rest correlation. One of the...
01 January 1970 741 1 View
Dear colleagues working with effect sizes or Pearson correlation, Have you (ever) though that the traditional descriptions for "small", "medium", and "large" effect size related to Pearson...
01 January 1970 9,092 1 View
