Search results

  1. gianmarco

    Chi square effect size - why to use the Crammer's V and not only Phi

    Hello, i do not totally understand your question, but I will try to answer. Phi does not reach its upper ceiling (1) for tables larger than 2x2. In this instance, better to use Cramer's V (which is also called Cramer's phi in some books). Hope this helps Best
  2. gianmarco

    Chi square test

    Hello, i cant remember but there should be an option in SPSS, either something to tick or a button to press (that would lead you to another menu). Apologies if I cant be more specific, but it's a while that i dont use SPSS (which I do not particularly like by the way). Gm
  3. gianmarco

    Chi square test

    Just a supplemetary note: you may want to inspect the (adjusted) standardized residuals to find out which cell significantly contribute to the departure from independence. Best Gm
  4. gianmarco

    Chi squared test assumptions not met

    Hello, the issue is tacked e.g. in Spatz's book (LINK) (pages 316 and following). When saple size (i.e., table's grand total) is large, small expeted frequenciesmight not pose a problem. Also, I think (but not totally sure) that Fisher's exact test might be carried out in your context. What is...
  5. gianmarco

    Long live SAS

    ouch...I wasnt kidding.....
  6. gianmarco

    Long live SAS

    the elephant is dead. Sorry
  7. gianmarco

    Long live SAS

    by the way, I want to run Excel on my Commodore64: That was the way I learned programming....back in 1986...I was 10 yr old.
  8. gianmarco

    Long live SAS

    Who's "he"?
  9. gianmarco

    Long live SAS

    To be honest, I'd like to be able to use Excel within R...sort of letting R tapping the statistical facilities of Excel.
  10. gianmarco

    Long live SAS

    I have switched back to Excel, which is the best when it comes to statistics
  11. gianmarco

    Chi square test to investigate further

    I provided you with a reply HERE. Not about chi-square tough, but CA is in some way related to chi-square.
  12. gianmarco

    R help

    Hello, from an exploratory point of view, you could use simple Correspondence Analysis in this case. I happened to come across something like that in relation to the analysis of newspaper headlines. You would need to reshape (or recode) your data a bit. For instance, you may want to build a...
  13. gianmarco

    All Chi sq residuals significant

    @hlsmith, thanks for the question, which is not so easy to asnwer in few words. CA is a dimesionality reduction technique used for cross-tabulation. Essentially, it allows you to display the deviation from independence by displaying the rows and columns of a cross-tab in a low-dimensional...
  14. gianmarco

    All Chi sq residuals significant

    That means that all the cells significantly contribute to the departure from the Null Hypothesis (in either direction; i.e., either featuring counts significantly lower or higher than expected). Just out of curiosity: how large is your table and what is your table's grand total? If you want to...
  15. gianmarco

    Is Chi square the appropriate test in this scenario?

    Hello, do you have spatial information about those burrows (i.e., geographic coordinates)? Just wanted to provide you with another perspective: the question could be framed "spatially"; in other words, one could wonder if satellite burrows tend to be closer in space to occupied burrows than to...
  16. gianmarco

    How to interpret the odds ratio (exp(b)) with a continuous dependent variable?

    As far as I remember, a 1-unit increase in the predictor increases/decreases the odss for the positive outcome of the DV by x. I happened to use LR (with both continous and categorical predictors) here: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0192039 You may want to...
  17. gianmarco

    checking whether I wrote a formula correctly in R

    Thanks @GretaGarbo for welcoming me back. By the way, the formula we discussed about regarding walking speed is for off-road walk...that could account for such slow speed at slope 0. Best
  18. gianmarco

    checking whether I wrote a formula correctly in R

    Hello All, thanks for your input. Yes you are right, I should have provided more context. The problem is that that formula is out from a larger code that I have used in a package of mine that has been released to CRAN abut 1 years ago...
  19. gianmarco

    checking whether I wrote a formula correctly in R

    Thanks Spunky.... what seems peculiar to you is the only thing I know is correct LOL. Forget that, and take it as the "slope" value...
  20. gianmarco

    checking whether I wrote a formula correctly in R

    Hello, I have been off the grid for some time. It's nice to post again something, and I look forward to hearing from you :-) As per title, I am wondering if I wrote correctly a formula in R. The formula, as derived from literature, is attached as an image. It aims at predicting the speed of...