Recent content by Christy127

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    Generalized linear mixed model, continuous variable, zero values

    I think that a zero inflated Poisson model is for count data, but my data are continuous. I guess a zero inflated gamma model could work but there is no such option in SPSS.
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    Generalized linear mixed model, continuous variable, zero values

    Hello, I have conducted a longitudinal study with four waves of data collection. My data have a nested structure: there are four levels in my data (time - level 1, student - level 2, class - level 3, school - level 4). Student sample size = 51 (no missing values) I want to fit generalized...
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    Friedman's test for ordinal variable

    Hello, Could I please get some feedback with regard to whether my thinking below is correct? My participants (n=51) were measured at four time-points participating in various activities. I would like to see whether their participation in each activity changed over time. Participation in each...
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    Effect sizes - Friedman's test

    Hello, I have a question regarding which measure of effect size to use. For Friedman's test, do I report the effect size when the result of the test is insignificant? For example, Field (2014) only reports the effect size of the post-hoc tests, but not the effect size for Friedman's test. If I...
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    Reporting Fisher's exact test (chi squared test)

    I found this link (http://www.pmean.com/00/fishers.html) which states the following: ******* "I did get an inquiry from someone about how to report Fisher's Exact Test in a publication. This is tricky, because this test only provides a p-value. Fisher's Exact Test has no formal test statistic...
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    Reporting Fisher's exact test (chi squared test)

    Hello, I have conducted some chi squared tests but because the assumption for "minimum expected cell frequency" was violated, I'm using the value for Fisher's exact. However, I don't know how I can report the output. For example, the normal chi squared would be reported like this: χ2 (1...
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    Significant Friedman's test but non-significant post-hoc tests

    Yes, small (n=51) and positively skewed - most participants had low scores. Thank you.
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    Significant Friedman's test but non-significant post-hoc tests

    No, my data is continuous, but non-normally distributed. That's why I used Friedman. I thought that Wilcoxon tests are the post-hoc tests after I conduct the Friedman's test, to check were the difference lies if the test gives me a significant result. Thank you.
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    Significant Friedman's test but non-significant post-hoc tests

    Do you mean that you don't apply the Bonferroni correction in your post hoc tests? So you use the ones that are below the 5% level? I only apply the corrections because everybody else in my field does it, so I just follow the norm... Another thing that I tried is I conducted Wilocoxon tests...
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    Significant Friedman's test but non-significant post-hoc tests

    Hello, I am running a Friedman's test because I want to see if there is any difference in my participants' scores across 4 time-points. My sample is n=51. I ran the test and it revealed a statistically significant difference (p = 0.29). Then I conducted post hoc tests to see where the...
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    Association between non-normal continuous variable and dichotomous variable

    Thank you. What do you mean when you say "random"? My sample is a convenience sample, unfortunately. Also, what do you mean by "control variables"? How can I add those?