categorical data

  1. K

    Categorical Variable Coding Question

    Hi! I have a question on the coding/use of categorical variables: In short, I have two control variables in an SPSS regression model. One is participant (15 levels, or participants) and one other categorical variable (10 levels). And there is just one predictor variable in the model. I've tried...
  2. M

    How can I make one frequency table out of multiple categorical variables?

    We are trying to create one frequency table (with frequencies or percentages) for multiple categorical variables, but whenever we do it, we always get a separate freqeuncy table for each of the variables, even if we drag all of them into the variable window simultaneously.
  3. D

    What does only one significant standardised residual mean in 2x3 Chi Squared tables?

    Hi everyone. I'm writing up a report for my advisor, which compares count data for three conditions, across two different groups. I therefore have a 2x3 contingency table I've analysed with Chi Squared, and am using standardised residuals as a post-hoc test. However, my advisor and are...
  4. B

    Goodness of fit test for categorical data with non-negative real numbersca

    An experiment that I conduct has 5 outcomes: A, B, C and D. I conduct 12 trials for this experiment. I observe, for example: Outcome : Frequency A : 2 B : 3 C : 0 D : 5 E : 2 Now, I have a model that predicts the...
  5. D

    Which method? Categorical data (IV) and continuous numerical data (DV)

    Thanks in advance for taking a look at my query I have been trying to get some statistical support from my local research department but I am getting conflicting opinions on which statistical methods I should be using to analyse my data. Any thoughts or insights would be much appreciated...
  6. F

    Prospective study. What test would be appropriate?

    Hey there! I am practicing on these data I have and I want to apply a statistical test. I want to compare 2 treatments: evolution and incidence of a certain disease after treatment. There were 3 groups taken into study: treated with A (n=78), treated with B (n=65) and C=control group...
  7. M

    Categorical data in SEM using AMOS. How can results be interpreted?

    I'm very new in SEM and I'm concerned about the reliability of Bayesian estimation of categorical variable in AMOS; then, if it is reliable, how can I interpret those results? How can I know which category is associated with the outcome in the latent variable? It is assumed that only that...
  8. B

    Scaling variables in regression

    If you need to scale variables in order to get the correct effect size and beta weight for each variable, does this mean you also scale for both categorical and continuous variables? For example: Model1=lm(DV ~ X + Y + Z) In the above equation, is it correct to scale for x/y/z or would...
  9. B

    Question about splitting data

    I am wondering what the most common way to handle data is wherein a participant belongs to multiple groups. For example, if you're wanting to run linear regression and look at how specific diet-type (IV) effects a specific health outcome (DV/response variable) and you have participants that are...
  10. C

    categorical variables in regression analysis and interaction terms

    I am learning multiple regression with categorical variables and in a book I came across this problem. For yield of corn suppose there are two factors affecting, nitrogen level and depth of ploughing. Say there are three nitrogen categories(1,2,3) and two depth categories(1,2). There's...
  11. C

    Interaction terms in regression-theory

    I am learning categorical variables and interaction terms in the regression course and there few things I don't understand. Suppose a salary data set with predictors experience X in years Education coded 1 for diploma , 2 for degree, 3 for higher degree Management M coded as 1 for a...
  12. A

    2-way Anova design repeated across an extra factor. Which approach is the best?

    Hello to everybody, I am a student working on a trial experiment to find the best combination of growing media, fertilizer application and container position to grow rooted Sitka spruce cuttings over one season. Attached is the description of the experimental design and a picture of...
  13. R

    Categorical data tested for several factors: which test should I use?

    Hi guys, I'm currently doing a research project as part of my internship on mangrove damage along a river as a consequence of a major flood event. Shoreline was analysed for 1 meter sections. For each section my data comprises of the categorical categories mortality (yes/no) and certain...
  14. A

    test of significance for comparing change between two groups

    What test for significance is best to use to test the difference between the change of a categorical variable in a control group and the change in a pilot group? I do not think I can simply compare the 'after' for each because the 'before' for the two groups was statistically different - they...
  15. M

    Logistic regression. How to combine classes in a mullticategorical variable?

    Hi, I’m preparing some data with a view to carry out a multivariable logistic regression. The dependent variable is LANDSLIDES, i.e. occurrence, and is dichotomous (YES/NO). The independent variables are a collection of environmental factors, such as VEGETATION, SLOPE, ELEVATION, and...
  16. A

    [PRIMER-E] How to include categorical variables in BEST routine?

    SOLVED - [PRIMER-E] How to include categorical variables in BEST routine? Hello, I would like to use the BEST routine in Primer to determine which abiotic variables, individual or combined, best explains the pattern present in my biological data. One of my abiotic variables - substratum...
  17. M

    Interpretation of GLM output for binomial family

    Hello everyone, I need help interpreting GLM output for binomial family and determining if this GLM is the correct one to use according to what I need to analyze. Noninvasive genetic sampling of a wild cat was conducted to determine sex. Different environmental factors were identified to...
  18. A

    when to weight frequencies and variables, and how to determine category boundaries

    Should income categories of a sample intercept survey be weighted to match the income proportions of the population of a city? Also, what guidelines should be used when deciding on category breaks between income groups? When looking at responses to various questions between income groups...
  19. T

    Missing value treatment for categorical & continues variables and testng MCAR/MAR

    Hello everybody, My dataset (N=90) consists of ordinal variables serving as IVs and dichotomous and continuous variables serving as DVs. IVs and DVs were assessed in two seperate experiments with the same sample. My proximal goal is to build scales from the IVs and the DVs. I am using PWSTAT...
  20. N

    Help in categorizing data

    Hi, I am working on my dissertation and am stuck with the data analysis. :confused: I am dealing with 4 variables, all of which are categorical variables. The unit of my data analysis is a dyad while the unit of data collection is an individual. All the variables are measured on an ordinal...