andersony3k
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@johndavid2 What is a large language model? :-)
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If you run a repeated-measures ANOVA with and without corrections for sphericity violation, you'll see that the corrections do not impact the post-hoc tests. There's nothing more to be done, since the question of sphericity doesn't apply to a repeat…
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I believe you've identified a limitation in JASP that tends not to be present in other stats programs.
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This is what happens when I paste into Word (for Windows): https://forum.cogsci.nl/uploads/574/AFX3FRAU4BZX.png
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Hi. It is not possible to calculate sphericity separately for each of the levels of your four-level repeated-measures ANOVA. Sphericity is a characteristic of the entire model, not of any particular level of the repeated-measures factor. Also, Wel…
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It's not the case that 'effect' of the covariate is controlled in all interactions. It's controlled in all interactions *except*, of course, those interactions that actually include the covariate. 'pse_condition * AQ -> p= 0.044' refers to the in…
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Post hoc tests are t tests that compare one category-level to another (with respect to mean values of the dependent variable). However, a covariate is an interval/ratio variable and so does not produce categories that can be subject to post-hoc t-te…
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I think the spirit of the frequentist significance test is to embrace assumption-violation. The frequentist test of Pearson's r assumes bivariate normality, while the frequentist test of Spearman's rho deliberately violates the normality assumption …
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From a frequentist perspective, there's never any need to have an algorithm that specifically tests a Spearman in contrast to a Pearson's correlation coefficient. To compute and test Spearman's one need only rank-transform each of the two variables …
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OK. Thanks. Here are the conclusions I've drawn with regard to instructing students and others on the use of R to compute new variables in JASP: " The JASP data set is accessed, *not* as an R data frame, but as a collection of *individual vect…
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Thanks. One thing I notice is that with your R code, you are creating a new vector rather than a new data-frame column (it was not obvious to me that JASP only wanted a new vector). However, it's still the case that if I use drag and drop to comput…
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Rather than being unable to complete the non-parametric test, it should generate an error message (it does for me). That's because, while Friedman's test is applicable to a single-factor repeated-measures ANOVA, it's not applicable to any other type…
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Yes, but that ratio appears to always be identical (within the estimation error of the model) to the prior odds of 1:1 multiplied by the Bayes factor, which is simply the Bayes factor (which JASP provides both for the t test output and the ANOVA out…
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Thanks for pointing that out to me. However, below is the JASP output for a Bayesian two-group ANOVA (preceded by a Bayesian t test on the data). I want to know the value of the posterior odds (OP) where: "Given the data, the odds of the altern…
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As an alternative, simplified approach, I would just do a MANOVA on change scores. Each of the five DV's would be transformed to a change score (i.e., post-minus-pre difference score). Thus the design would be a one-factor MANOVA with group (Group …
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Still, regarding the following data frame: mydata = data.frame( person = c(1, 2, 3), q = c(10, 100, 1000), r = c(20, NA, 2000), s = c(30, 300, 3000) ) In base R, one way to get a mean for each person is . . . …
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Santa left me nothing but a lump of coal.
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Yes, that seems correct.
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Hi. I think, no: When multiple numbers appear on the same row, they should belong to the same participant rather than to different participants. For repeated measures ANOVA, the data should be organized like this . . . https://forum.cogsci.nl/upload…
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It seems from this thread that all of JASP's Bayesian analyses may be missing crucial bit of output. In my opinion, the most useful aspect of Bayesian (as opposed to a frequentist) analysis is that the former provides a ready answer to the following…
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I don't know the answer. But I predict that when an answer comes it will include phrases such as "R emmeans package," and "Welch-Satterthwaite degrees of freedom." ;-)
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But there does not appear to be a consensus that linear mixed models rely on a sphericity assumption: "Another advantage of mixed models is that we don't have to be consistent about time. For example, and it does not apply in this particular ex…
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@harlowhenry Is this forum an official JASP support channel?😉
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My understanding is that "Bayesian Repeated-Measures ANOVA" is a misnomer. What JASP calls "Bayesian RM ANOVA" is really a Bayesian linear mixed-effects model (with a tweak or two). And I'm fairly sure that while "sphericity…
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If indeed "all dens are different," then I think it would be appropriate to simply compute either Kendall's tau-b or Spearman's rho to assess the rank correlation between year and den height.
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Hi. In addition to removing the 1st row, there are some basic ideas you need to keep in mind. Any "scale" (i.e., "continuous") variable needs to consist of numbers. However, your age values aren't numbers (numbers don't have hyph…
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In JASP, there's no option to output uncorrected (i.e., Fishers LSD) p values for post hoc tests. However, you can do contrasts, with each contrast encoding one condition as +1 (the other conditions as -1, and the rest as 0). I believe the results w…
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juehoe When you say you want to "add zero as a missing value," I assume that there are currently zeros throughout the dataset, but that for a few columns, all of the zeros should be treated as missing values. If that's the case, then for e…
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You have to hover then click-and drag the little triangle to change the plot's size and dimensions. (Note: It will revert back to the default upon closing and then re-opening the jasp file.) https://forum.cogsci.nl/uploads/805/IQD8HDLO0YLD.png
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Yes, it's a two-way ANOVA. More specifically, it's a two by three ANOVA. Here's the explicit plot of the main effect of Type of Breach: https://forum.cogsci.nl/uploads/304/CQ1WN4FVQ1MF.png If you want to a graph that shows the significant main effec…