In my last blog post, I wrote about a mistake I once made when I didn’t realize the defaults for dummy coding were different in two SPSS procedures (Binary Logistic and GEE). Ironically, about the same time I wrote it, I was having a conversation with Ann Maria de Mars on Twitter....
First, we set out the example we use to show how to create dummy variables in SPSS Statistics, before explaining how to set up your data in the Variable View and Data View windows of SPSS Statistics so that you can create dummy variables. If you are unfamiliar with the use of dummy ...
Thank you for sharing your knowledge. The article was very helpful for me. I have another question which is related to the next step, Interpreting and writing the regression equation from outputs. As you know, software will determine the estimations for each variables. If we have a categorical...
To apply the procedures introduced in these papers, called weighted effect coding, procedures aremade available for R, SPSS, and Stata. For R, we created the‘wec’ packagewhich can be installed by typing: install.packages(“wec”) 转自:http://www.rensenieuwenhuis.nl/weighted-effect-coding-...
dummy-codedvariables. Todummy-codeavariable,wefirstidentifyonecategoryorsubgroupofthenonmetric variableasthereferenceorcomparisongroup.Theeffectswhichweidentifyinour analysiswillbedifferencesfromthereferenceorcomparisongroup.Forexample, supposethatIwerecontrastingsalariesofmenandwomeninsomegroupofemployees andIwas...
Most software packages (such as SAS, SPSSx, BMDP) include special programs for performing stepwise regression. The user of these programs has to code categorical variables with dummy variables. In this case the forward selection might wrongly indicate that a categorical variable with more than two...