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  1. gianmarco

    simple count - type of data

    In my opinion, you have two categorical variables: words recalled (with 50 levels, 1 for each word) and condition type (with 2 levels). Besides understanding what type of data you are dealing with, it would help knowing your research question or analytical goal. Best Gm
  2. gianmarco

    am i approximately chi-squared?

    I missed the nonsense a lot
  3. gianmarco

    Which is Your Favorite Free Statistical Analysis Software?

    As for JMP, I edited my earlier post.
  4. gianmarco

    Which is Your Favorite Free Statistical Analysis Software?

    My 2 cents: PAST is used in different research fields and is tailored particularly for palaeontology. Lots of modules; very good graph facilities. Used by scientists world-wide. Worth keeping on your computer. JAMOVI: an free and open source alternative to the more cumbersome SPSS. Modules can...
  5. gianmarco

    Multiple regression of categorical variables

    Just to give you an idea of a use of LR, you may want to have a look at the following article: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0192039 Besides the specific field on inquiry, you may find some info about LR and examples of the interpretation of the results. I...
  6. gianmarco

    Multiple regression of categorical variables

    I think you should look into Logistic Regression, if your dependent variable is categorical. The independent variables (predictors) can be either continous or categorical, or both. But consider that there are some rules of thumb when it comes to the number of predictors vis-a-vis the number of...
  7. gianmarco

    Measuring data homogeneity

    Hello, in my earlier field of study (archaeology/anthropology), researchers dealing with pottery production were "measuring" standardization of pottery shapes using the Coefficient of Variation of certain vessels' measurements. Your idea of using the Standard Deviation would seem ok at face...
  8. gianmarco

    Long to wide format... how is it again?

    At least, you are like that sometimes....I am like that most of the time!!!!
  9. gianmarco

    Clustering univariate measures

    Hello, once I read an interesting chapter: Arroyo, J., Maté, C., & Roque, A.M. (2006). Hierarchical Clustering for Boxplot Variables. Data Science and Classification. The authors were suggesting to use the "ingredients" of a boxplot (quartiles, median, etc) to calculate a sort of manhattan...
  10. gianmarco

    How to compare the ranking of six items to a correct ranking for each participant.

    Not to be defensive, but calculating absolute differences is not that unknown in data analysis. The mean (and median) absolute deviation is a robust "substitute" for the standard deviation. Also, Manhattan Distance rests on pair-wise absolute differences. So, if your goal is coming up with a...
  11. gianmarco

    How to compare the ranking of six items to a correct ranking for each participant.

    Just a quick suggestion, maybe some one can provide a sounder help. To come up with a value that may express how close is each participant to the "correct" ranking, you might calculate the absolute difference between the rank assigned by each participant and the corresponding "correct" rank...
  12. gianmarco

    HELP. "Comment on the appearance of the plot"

    SPSS which drives me mad !!
  13. gianmarco

    Determination of optimal number of clusters (stpping rule) with similarity measure (Jaccard coefficient)

    Hello, It's a while that I do not deal with cluster analysis, so please take y words with a grain of salt. As far as I recall, there is a large literature on the way in which one should decide where to "cut the tree" and, consequently, to decide how many clusters can be read off the dendrogram...
  14. gianmarco

    A basic question about chi-square test

    It would seem that the online calculator can only handle 2x2 tables (2 rows x 2 cols). This for example can handle larger tables: https://www.icalcu.com/stat/chisqtest.html
  15. gianmarco

    A basic question about chi-square test

    It would seem that the online calculator can only handle 2x2 tables (2 rows x 2 cols).
  16. gianmarco

    Best software for organizing journal articles?

    Yes. I agree about Mendeley. I have been using it on a daily basis, to organize my references and to read articles and books (using the in-built highlight and annotation function). But there is something a little annoying: for two reasons (to quick add a citation and to read the PDF of an...
  17. gianmarco

    Categorical variables in SPSS - Chi-square and then what?

    Hello. First, a general comment on the cross-tab itself. If your goal is to test if there is any association between age and knowledge, I would drop the variable regarding nationality. Such complex table is difficult to read. If you want to spot which cell significantly contribute to the...
  18. gianmarco

    Discriminant Analysis biplot interpretation

    Hello All, it's been a while since I posted something. I'd like to have some insights on the interpretation of a LDA biplot I am working with. I have run LDA in R, using MASS::lda(), on a dataset made up by a number of clay samples from 3 geographical areas; the predictors are 9 oxhides coming...
  19. gianmarco

    Variable Type query- Discrete Categorical

    Hello, i would call that a dichotomic categorical (or nominal) variable, such as 'gender' for instance; it includes two mutually exclusive levels (male/female). Best Gm
  20. gianmarco

    Chi-square test for multiple rows contingency table

    I believe that chi-2 test can be applied. At the end of the day, what you are trying to test is if there is a dependence between rows and columns, i.e. symptoms and disease. In case the test turns out to indicate a significan association, you may want to use standardized residuals to pinpoint...