chi sq test

  1. O

    Need some help on my calculation

    Basically I used a program to roll 2 dice and see the observed outcomes compared to the expected outcome. Doing 100 rolls I should expect to see around 17 doubles. I then added up the values for the critical value and put them in a calculator and got Does this mean that it's unlikely to get...
  2. W

    How to analyze a categorical confounding variable for experimental results

    I ran an experiment. The experiment had 3 conditions (C1,C2,C3). I analyzed the results which are countably infinite variables (e.g. - number of points) or a finite set of numbers (e.g. - on a scale of 1-5 how much did you like this?). I have two questions in regards to this data and possible...
  3. S

    Paired variables?

    In our research on apprenticeships in early modern times, we have a series of observations (cases), each with several variables. Each observation is unique because of its combination of the variables "student name" and "starting date of the apprenticeship" (a certain "student name" can occur in...
  4. F

    Testing help

    Hi all, Not sure if any one can help but here goes. For a recent research i carried out a survey on moths. I picked 2 separate areas, wooded area and a totally different area habitat wise. Area "A" and Area "B" For each area i mapped out 10 unique collecting sites. I then carried out the...
  5. O

    Corelation between two dichotomous variables

    I have a data from a research with responses (yes/no) about three questions (A,B,C) and I would to see if the variables are correlated. First of all i compared the proportion of agreement(yes-yes, no-no) of them. The results was: A-B= 78% A-C=59% B-C is out of my objective. So I run a Pearson...
  6. P

    Statistical Test for multiple choice questions

    I Iaunched a survey recently where I have the following types of questions - 1) A multiple choice question (where users can mark more than one correct answer), let's call it variable a. 2) A single choice answer type question (radio button type), let's call it categorical variable b. 3) A...
  7. P

    Derivation of random variable for chi-square distribution.

    Hello all, In the chi-square distribution, how is the value of random variable derived. In the textbooks, the random variable is given directly as. 1st equation is for random variable, 2nd value is the test statistic used during inference of variance of a population. Source: Introduction to...
  8. R

    Chi - Square Test for test of independence of variables in different treatment groups

    Hello together, I have a question concerning my bachelor thesis. It is the first time I am actually doing statistical analysis on my own and so recommendations are very welcome. I work with a huge dataset of N=30000 with 10 randomized treatments group (variable „Treatment“ going from 0 to 9) and...
  9. M

    Should I use some sort of Chi Square Distribution or another method... Any assistance is greatly appreciated.

    I am asking for assistance or guidance to point me in the right direction for this problem I am trying to find a solution. Problem: I need to come up with a percentage to show a Severity of Defects for monthly software releases at my company. Each month our customers inform us of bugs/issues...
  10. M

    Chi Square & Weighted Average

    I am asking for assistance or guidance to point me in the right direction for this problem I am trying to find a solution. Problem: I need to come up with a percentage to show a Severity of Defects for monthly software releases at my company. Each month our customers inform us of bugs/issues...
  11. 9

    Using a chi square when comparing treatments

    Greetings, I have the following data for two different medicines (one currently being used and one new). The data is number of treatments and number of pregnancies Bemfola - AID (136, 29) Gonal F - AID (262, 37) Bemfola - AIH (95, 9) Gonal F - AIH (150, 11) The null hypothesis is that...
  12. G

    Need help selecting appropriate test

    I'm currently trying to select the appropriate significance test and test of association and would really appreciate some help. My independent variable is an ordinal subjective risk assessment (1-4) and the dependent is continuous (amount of data shared). I have yet to determine if I can use...
  13. N

    1-sample binomial for my research data?

    Hi, Newbie here so I will try to explain as clearly as I can. I do research in the neuro field. I have a control group of neurons that I am analyzing for the presence or absence (binary) of a specific trait (let's call it trait A). I found that the control group have A 60% of the time. Now I...
  14. P

    How to apply Chi Squared test according to this Simulation?

    Hi there, I have been wondering about some points of Chi squared test. I would like to introduce the following scenario to better clarify my question: Let's say that one day while doing research on the city of Villy God has appeared to me and told me that city there are 10,000 adults...
  15. P

    Interpretation of the Likelihood Ratio Chi-Square Test Statistic

    Do I still use the Chi-Square distribution table to determine the significance of the Ratio Likelihood Chi-Square test statistic? I know you use it for the Pearson's Chi-square test statistic, so I am unsure whether to same rules apply. I calculated the Likelihood Ratio Chi-Square in SPSS...
  16. M

    Multinomial probabilty

    Hi, Could anyone suggest what test should I apply in the case I have probabilities of 0. For example, I have a vector of counts 127,2,1,0 and I want to test if this vector fits one of the following probabilities (for example) p1=1,0,0,0 ; p2=0.75,0.25,0,0; p3=0.5,0.25,0.25,0 At first I...
  17. S

    Approach to adjusting for multiple testing problem with multiple chi-square tests

    Hi, I work in a UK university. Each year finalist students take part in a National Student Survey responding to 30 questions on aspects of their experience on a five point likert scale, ranging from strongly agree to strongly disagree, and the convention is to report the percentage of...
  18. J

    What statistical calculation to use and which R function?

    Here's the data I have... I have a "national" sample (the control) showing the actual number and percentage of people in the sample that have a specific characteristic. Let's say there's data on 10,000 people that are all classified as either loving cats or hating cats (Yes or No). I then...
  19. H

    Not sure if i chose the correct statistical test to analyze data

    I'm trying to help a friend out with the statistics parts of her bachelors paper. Right now she is still the the planing stages and has not gathered data yet. She is trying to figure out the effects of peer-support counseling for cancer patients and their family. Her problem (and mine) is...
  20. B

    Chi Square

    2. A recent survey of 1,223 children, ranging in age between 8 and 12 years old, reported the following results. Suppose that the survey was based on 600 boys and 623 girls. What Tweens did : Boys/ Girls Played video game: 498/243 Read a book for fun 276/324...