nominal variable

  1. A

    How to check for multicolinearity between two categorical variables when their contingency table contains many zero entries?

    Problem: I have to build a multiple regression model where most of my predictor (independent) variables are categorical (nominal) but I'm running into a few problems due to some of the predictors being (perfectly) colinear. So I need to check for multicolinearity and remove redundant predictors...
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    Help with regression and related nominal values

    Hey all. I'd like some input on a regression analysis. I have data that measures the reactions of individuals to a number of objects and to a number of questions. It looks something like this (Q=question): Q1 Q2 Q3... Obj1 45 23 52 Obj2 65 67 02 ... I have...
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    What is best method to calculate correlation for 2 nominal variables?

    Hello, I am analyzing data that looks at several nominal variables (e.g. employment status, race, gender, etc.) to determine if it plays a factor in the person's adherence to medication (also a nominal variable). What is the best way to do that? From what I've read on the forums and...
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    Mixed model, repeated measures, manova, nested? nominal

    Hi. I am not sure how to approach the statistical analysis of the following study. Any insights would be greatly appreciated. Thanks! So, I have two independent groups, group A and group B. I am collecting data for 3 different tasks (Task 1, Task 2, Task 3) at 3 different time points, Pre...
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    Linear Regression:Controlling for categorical independent variables, WITHOUT dummies?

    Short version: Does including a categorical nominal-level independent variable WITHOUT dummies still work as a simple control for other independent variables? e.g. for P = b0 + b1*Grades + b2*WordCount + b3*Sex + b4*Major With 6 possible categories for Major, I know b4 is meaningless since...
  6. A

    Test for correlation and differences in correlation - nominal and interval variables

    Hi, I've got two types of variables - nominal (mode choice (e.g. car, bike, etc...) and interval (income range (e.g. 10,000-15,000, 15,001-20,000, etc...). I am trying to figure out the best test to see if the variables are correlated, and then I want to test to see if the correlation is...
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    Non-parametric statistical test with two nominal variables

    Hello everyone,:wave: I have the following data: feces density of a carnivore species subdivided according to sex. I am looking for appropriate test suggestions. I have calculated the density according to main habitat types, topography, and road types. To determine if results are...
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    [LisRel] How can i add a polychoric correlation to my LisRel syntax?

    Hi everyone, I'm creating a structural equation model for my research by means of LISREL. Recently, i noticed that the order of my variables in my prelis file changed my entire model. I started by simply importing my spss file in Lisrel, updated the variable type and created a covariance matrix...
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    Nominal Mediation - Is it possible to test for mediation with a nominal dependent?

    Hi everyone, I'm currently working on my thesis which involves mediation using nominal independents and dependents, as well as scale mediators. I understand that binary mediation is possible, using logit or probit models. However, is it possible to test for mediation when your dependent...
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    Is this ordinal?

    Hi, My question in a survey is "What do you belive the general view of experts is regarding the causes of Climate change" and the answer options are : [ ] All scientists believe climate change is mostly due to Human contribution? [ ] Majority of scientists believe climate change is...
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    Some questions about one-way ANOVA in JMP 9

    One-way ANOVA can be used to estimate the contribution of a variable (x) to the variation in another one (y). I have some questions about it: 1. How to perform it in JMP 9? I am eager to get the R square. 2. Is this R square identical with the one by multivariate regression? 3. In ANOVA, is...
  12. A

    Is Chi Square the right test to use?

    Dear all, I am having a bit of trouble figuring out which test to perform in the following case: In my eye-tracking study participants are viewing short video clips of people's faces and I count the number of times each of five face regions are fixated by each participant. I have one...
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    Crosstabs Interpretation?

    Hello, I'm trying to figure out how to interpret the proportion (Z test) calculated in the crosstab table in SPSS. In the attachment, in crosstab 1, i'm trying to analyze graduates as my DV by module #. By the numbers it seems that there would be significant difference in proportion on Module...
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    HELP! Stats method for comparing curves?

    Hello all, I was hoping you guys might be able to assist me, I'm in the middle of writing a biology honors thesis and I'm trying to compare the thermal accumulation of different years to see if there's a correlation between them thermal accumulation trend line and an epidemic or non-epidemic...