chi square

  1. I

    Chi square test: how to solve this one ?

    A dentist observed that most of the patients have cavities in their teeths at the right-side of their mouth. (see data: observed values) The hypothesis is that most of the people are right-handed and therefore they brushing their teeths better on the left-side then on the right-side of their...
  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. P

    I'm Confused Between Independent T-Test, Mann-Whitney And Chi Square Test?

    hello everyone, i need your help regarding these statistical tests since i'm not really big on stats. i want to know if there are any significant difference between the two groups in my study. i'm confused which statistical treatment i will be using. here's a little background on my study. i...
  4. S

    Chi square and Z test for proportions for nominal data

    I believe that to analyse 2 sets of nominal data chi square test is used ... can't we use Z test for proportions also to analyse 2 sets of nominal data ...
  5. O

    Comparing two large categorical data sets with low counts

    I'm studying a biological feature which can be classified into 2^20 categories. These categories can be thought as a dictionary of a fixed-length words made up from an alphabet, to say, 20-letter words from a binary alphabet. I also have two samples consisting of 3 million and 1 million entries...
  6. D

    Evaluating Ranked lists

    Hi, I implemented ranking algorithm to rank relevant documents to a given topic. So the algorithm produces ranked list of documents for each topic. For example: Lets say topic A has 25 relevant documents, our experiment select another 25 random documents and rank these 50 document for the...
  7. R

    Multiple value Chi Squared test in SPSS

    Hello, I am currently doing a study into factors that affect mortality in a particular type of bacterial infection. I would like to compare certain patient characteristics. One of which is the specialty that the patient is under. I currently have a variable in SPSS that has three values...
  8. M

    What expected frequencies should I use?

    Hello, I'm in the middle of my dissertation and are struggling a little with finding the appropriate expected frequencies in a few Chi-Square tests of single variables. Example: My hypothesis is that recruiters are moderately to strongly impressed by XYZ. The null hypothesis is...
  9. X

    Need help with general statistics problem please

    How do you find the expected frequency? The follow table shows the results from 180 students randomly choosing among the numbers 1 to 10. Test to see if the students were actually choosing digits at random, using an alpha of 0.01 Digit_______1__2__3__4__5__6__7__8__9__10...
  10. S

    Chi Square for Likert Scale in Single Sample

    Evening All, I do hope someone can shed some light on my fog of the chi square. I conducted a single sample survey using Likert Scale scored 1-5 (1=Strongly Agree to 5=Strongly Disagree) to survey employees in medical practices on leadership behaviors during a major transition. The goal was...
  11. P

    Likert type data and testing group differences

    Hello, I have a Likert scale (5 points) with 37 items. And I have some independent variables such as gender and age (4 categories). I want to test differences between gender and age for all of the items. For example I want to test if there is significance difference between girls and boys...
  12. E

    memory study - parametric or non parametric test

    Hello there, I've conducted a memory study which aim is to evaluate the effect of the spatial position of a visual object (left upper, left lower, right upper and right lower quadrant of the screen- independent variable) on its chance to be correctly recalled in 2 memory tasks: the first is an...
  13. L

    t-tests vs chi square test/Fisher's exact test

    Hello forum friends! So I have been using excel to compare if two groups are statistically significantly different. My null Hypothesis is that these two groups are the same (or that there is no difference between groups). When comparing my Hispanic population vs non-Hispanic population...
  14. P

    Address whether one overlap is significantly bigger that of another related overlap

    I could really use a hit as to which statistical test I need to use to address the following problem: I have three different species: A, B and C. I have compared the quantitative overlap (i.e. something that was measured and counted in all 3 species) of Species A and B, respectively, with...
  15. A

    Dependance between categorical variables in a whole population

    Hello, I have a population of 507 documents (which represent the entire phenomena studied at a give time period) from which a series of variables -most of which are nominal- where extracted. The end goal was to describe said phenomena and establish the possibility that the outcome is...
  16. M

    Chi Square

    Hi, If I perform a chi square test and get a p value = .000 but Phi value is negative this means that the relation between the variables is negative? I mean, as 1 variable increase, the other must decrease? Or i can not say that based on a negative phi value? Since the chi squere result...
  17. S

    Chi Square Expected Count less than 5!

    Hi there, any help needed with my problem would be MUCH appreciated. I have a 2x7 design. Gender VS different treatment options. I did a Pearson's Chi Square and my expected cell count was less than 5 in more than 20% of cases and some expected counts were also less than 1. SPSS does not...
  18. J

    Unequal group sizes and chi square test of independence

    I began working on a project that compares birth outcomes of women in a case management program (n = 270) to the birth outcomes of the general population of delivered mothers in the state (n = 56,001). We were critiqued for testing with chi square for group differences on several birth outcomes...
  19. B

    Kruksall-Wallis VS Chi-Squared

    Hello, I'm working on an MSc project and struggling with the stats side of things (I'm a linguist, not a statistician). I have data on 2 children telling me when they use certain verb types in response to an animated video clip. Each video clip has received a rating of perceived humanness...