chi square test

  1. C

    Chi-Squared Help

    I am working on a homework set and I am very confused on this question...Can someone help me understand? What's wrong with this statement? Chi-square analysis will tell us whether two qualitative variables are correlated. 1.There is no statistical test for the correlation between two...
  2. R

    Degrees of freedom for Chi2 normality test

    I have found mixed information in regard to the number of degrees of freedom used to evaluate the chi2 statistics derived to check the normality of a given data set. In one case I found that df = Nbins - 3 and in other cases I have found df = Nbins-1 The idea of this test is to divide the...
  3. M

    Chi Square Test, Pre Post Study, Dichotomous Variables, Different Group Sizes

    Hi Everybody, I am a medical student. I am doing a Final Year Project (FYP) and need a little help. I must admit to being a novice statistican and apologise if this question is a little dumb. My FYP is a pre-post study (i.e. pre-intervention and post-intervention). Variables in my study...
  4. K

    [SPSS] Comparison to homogeneous distribution.

    Hello. This is my first post here, please forgive any mistakes. I am designing the statistics for a project. The aim is to compare samples taken against a perfectly homogeneous population. I have identified both Similarity Factor and Chi-squared as potentially good statistics to utilise. I...
  5. A

    multiple-response categorical variables - what is "n", chi-squared

    Hello, I am doing independence checks (chi-squared tests) on two variables. One of the variables is of the interval nature and the other is a multiple-response categorical variable. Couple of questions: 1. What is "n"? The number of respondents, or the number of responses, or...
  6. C

    chi-squared hypothesis test of homogeneity using R

    A survey of drivers was taken to see if they had been in an accident during the previous year, and if so was it a minor or major accident. The results are tabulated by age group: \begin{array}{c|lcr} \text{Age} & \text{None} & \text{Minor} & \text{Major} \\ \hline \text{under} 18 &67 &...
  7. J

    Pre/Post Comparison of Percentages, Two Populations

    I would like assistance in selecting tests for two scenarios. I am simplifying a bit here, but basically I want to do a comparison of the percentage of patients who come in for a second appointment, comparing 2011 against 2012. 1) In the "Ideal" case, the two populations are separate. What...
  8. E

    multiple comparison of chi square tests of binary data

    Hello everybody, the code below is to illustrate how I examined the (significant) differences in certain characteristics between different regions. The data set is non-parametric so I used the Kruskal Wallis test and for multiple comparison between the regions I used the function kruskalmc. I...