chi square

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. J

    Cumulants of non central chi-square distribution

    Cumulant generating function is defined by logarithm of Moment generating function. K_X(t)=\log M_X(t) let X is a non central \chi^2 variate with parameters degrees of freedom,n and non-centrality parameter,\lambda. Moment generating function of X is...
  15. J

    An Exercise of noncentral [math]\chi^2[\math] distribution.

    An Exercise of noncentral chi-square distribution. Let Y_1,\ldots,Y_n be independent random variables with Y_k distributed as N\sim(a_k,\sigma^2) , and \bar Y=\sum_{k=1}^{n}\frac{Y_k}{n} denote the sample mean, S^2 denotes the sample variance. Then show that...
  16. D

    need some help

    Hello, I need some help with this task: The price at which buyers are willing to pay for a book subdivided by chi square distribution with an unknown parameter k. 18 out of 118 customers bought book For £ 20. And I need to evaluate the unknown distribution parameter k. I would appreciate...
  17. P

    How do I interpret chi square goodness of fit results in R?

    I am a newbe in research and using R. I had to calculate the chi square to determine goodess of fit and I don't know how to interpret the results. Below is the results from R. Model Chisquare=2.060748 Df=2 Pr(>Chisq)=0.3568734 What does this mean and how do I interpret?
  18. S

    Likert Type Questionnaire Analysis.

    Hi everyone, any help you can offer me with my stats would be so greatly appreciated! Everytime i think i've worked it out, i end up confusing myself even more! Okay, my research is looking into whether perceptions differ both between male or female offenders across how they are related to...
  19. D

    Chi Square, Likert Scale, and Within Group - reasoning

    I am hoping some really smart folks can answer this question for me and provide some sage and learned advice to help me finish the last piece of my PhD dissertation research. Background: I have completed a data study, using a Likert Scale (1-5), on importance of an element within an...