chi square

  1. S

    Goodness-of-fit of model derived from multivariate logistic regression

    I have a question regarding the relationship between the value of Chi square and df in determining the goodness-of-fit in a model derived from multivariate logistic regression. If the N= 290, Chi square =26.57, p=0.003 in a model with 16 variables (df is not reported), can one tell if this is...
  2. T

    Chi-square, expected counts & Fischer exact test

    Sitting here with a stat book and some questions are popping up. Chi-square assumes that expected counts are greater than 5. However, in larger tables it is allowed to have up to 20% of expected counts less than 5. What is this 20% of? Is it of the cells in the matrix. For example, in a 2x4...
  3. T

    Pearson's chi-test for more than 2x2

    So, I have one stat book (Discovering Statistics by Andy Field; great book) that discusses Pearson's chi-test and how it's only applicable to a 2x2 contingency table with categorical data. The solution is to use the loglinear analysis for larger tables according to Andy. Another book I have...
  4. G

    Chi Square Test For Independence with Likert Scale

    Hello, I would like to do a Chi square test for independence with a Likert scale to see if there are any associations in gender and education level with regards to ethical consumption. Each question of my likert scale has 5 categories (definitely wouldn't buy it, wouldn't buy it, might buy...
  5. V

    Is a chi-square test appropriate? Can I make a more comprehensive analysis?

    Hi There, I am new to the research field, and I am currently trying to find a way to apporpriately analyze some data that I have collected. I am working in the biological sciences, and have read through the pages of suggested tests at http://udel.edu/~mcdonald/statchiind.html - which was...
  6. E

    Statistical Analysis Plan - help!

    I'm doing a summer research project on trends of anxiety and depression. Unfortunately, my preceptor has disappeared in the meantime and I'm left to fend for myself. I've done an extensive literature review, and now have to develop a Statistical Analysis Plan (SAP). While I understand that there...
  7. S

    Stratifying data with chi square analyses

    Hi I've carried out a study where 26 participants had to make decisions about 20 scenarios (i.e. 520 decisions in total). Decisions are marked as 'correct' or 'incorrect' i.e. are binary. I believe that chi square analysis is the "go to" in these situations. I was wondering if there was a...
  8. M

    Chi-square or test of equal proportions?

    Hello First post on the forum. I'm currently studying for my ordinary certificate from the Royal Statistical Society and using the textbook "Introducing Statistics" by Upton and Cook. Dispite pouring over the textbook I'm still confused as to which test to use for the following situation...
  9. J

    Statistical analysis for Rubric Based Research

    There are 26 participants who have participated in my research. Each participant treated with a lab module (Hands on Robotics Session). Now each participant will be evaluated using a rubric on scale of Excellent, Good, Fair and Poor. For my research i want to evaluate the following questions...
  10. M

    AMOS Bootstrapping - Mean Chi Square/df?

    Hi, I am working on a project modelling a variety of psychological outcomes for AIDS-affected youth in South Africa. Inevitably, some of our variables are not normally distributed, so we have used the bootstrapping procedure available in AMOS to estimate paremeters in the model...
  11. Junes

    Comparing museum visitors numbers using non-parametric method

    Hi all, I'm supervising a student who is going to do her research on visitor numbers to a certain exhibition. The museum will be actively promoting this exhibition in the month to come. The museum wants to know whether this marketing campaign had an effect on visitor numbers. So, we...
  12. A

    Is a Chi Square an appropriate test for this situation?

    Hello : ) I've been struggling for a while with this now; any help will be very much appreciated. I'm working on a project, which in part looks at whether the same whales are seen together more often than would be expected by random chance. Looking through my text book I thought the Chi...
  13. K

    What are some statistical tests for the relationship between two variables?

    Hi, I posted previously, but I haven't got any response, I assume its more appropriate to post in this forum, that's why I'm posting again. How do I test the relationship between Govt. Spending on Police and the Number of robberies (annually) I have 51 data points. I've done Pearson's, I...
  14. S

    Categorical data goodness of fit question

    Hello, I am trying to fit a log linear model with proc genmod and when i include all interactions (3 variables) i get the following: Criterion DF Value Value/DF Deviance 0 0.0000 . Scaled Deviance 0...
  15. B

    cross over trial

    Good day I would like some imput on what whould be the most appropriate test to do in this case: I have a cross over trial in which two products administered to an animal is deemed accepted (retains the product in mouth) or refused (animal drops the product out of mouth). Half of the...
  16. F

    Question about proper test

    Respected experts! I have a table with different aminoacids in rows and different species in columns. Every cell contains relative amount of current aminoacid in the current species. (continuous data). The hypothesis to test (null) is that distribution of aminoacids does not depend on species...
  17. M

    comparing frequencies

    I have a survey question that asks which of 3 activities participants regularly participate in. They are told “select all that apply.” So they can mark any or all of the activities. As results, I get frequencies (# and %) for each activity. Now I want to compare the frequencies of the...
  18. S

    chi square test

    I am running a chi square test, followed by a marascuilo test to compare a binary resonse with categorical variables as the independent variables. The dilema is that my total sample size is 1,000,000 so I am getting chi square values in the thousands, with no major differences in the actual...
  19. S

    Fisher's exact test

    I have always learned that if you have a contingency table that violates the chi square assumption of more than 20% of cells having expected count less than 5, the chisq. test is invalid. If that happens use the fisher exact test. SAS is the only program that I have found to support the test...
  20. H

    did i use the right test to compare the effectiveness between two groups? chi squar.

    my study included 825 total cases. Out of which, 377 cases are culture positive to fungus. But only 364 cases are smear positive. So, i compared the effectiveness of these two tests: culture test and smear test. I then selected chi square fourfold test , group 1: culture test & group...