dummy coding

  1. I

    dummy variables in logistic regression

    Hello everybody I have a logistic regression: The dependent variable is dichotomous and was measured in four different countries (A, B, C, D) There are several explanatory variables. One of them is the country where the dependent variable was measured. When I use the "country" as...
  2. S

    Basic doubt - dummy code vs. hierarchical model

    I have a basic doubt on when to use country code as dummy coded control variables in regression and when to model it as a higher level variable within which other independent variables are nested. In my specific study, I have borrowers from several countries using an online P2P portal for...
  3. A

    Expert Help Required - Multiple Regression with Nominal and Scale Variables

    Hi all, I'm having huge issues with the assumptions of multiple regression and determining whether I am running my analysis correctly. First of all, I have eight different predictors and one outcome variable. The idea is to determine whether each variable is a significant predictor of the...
  4. E

    Difference in Difference-SPSS: Creating dummy variable

    I am doing a program evaluation and want to use difference in difference analysis. I calculated the difference in difference by hand and now want to perform a regression. I have made a dummy for 1=treatment and 0=no treatment. But since I have done my pre and post test on the same...
  5. K

    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. D

    Logistic Regression: To dummy code or not to? Which backward elimination to use?

    I have 10 binary dependent variables (disease prevalence: yes/no, 1/0). I want to do a logistical regression with each of them with the following binary categorical independent variables: - Year (8 levels) - Gender (2 levels) - Age (11 levels) - Season (2 levels) - Location (10 levels)...
  7. S

    Generate large dummy variable

    Hey guys. I'm actually a little depressed that I can't figure this one out myself - mostly because it, instinctly, seems easy. Lets say I want to create a data set from scratch. I have a variable, var1, and I want it to be a dummy variable with a specific amount of each. Let's say I want...
  8. T

    Mediation Analysis with Categorical IV with 4 levels

    Hello all, I would like to do a mediation analysis using the following 3 variables: 1. Integration Strategy: This is the independent variable. It is categorical and has 4 levels 2. Perceived Pressure to Assimilate: This is the mediator variable. It is continuous. 3. Readjustment...