text: Please specify whether your issue is about:
  
   - [ ] a possible bug
   - [ ] a question about package functionality
   - [ ] a suggested code or documentation change, improvement to the code, or feature request
  
  If you are reporting (1) a bug or (2) a question about code, please supply:
  
   - [a fully reproducible example](http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example) using a publicly available dataset (or provide your data)
   - if an error is occurring, include the output of `traceback()` run immediately after the error occurs
   - the output of `sessionInfo()`
  
  Put your code here:
  
  ```R
  ## load package
  library("margins")
  
  ## code goes here
  
  
  ## session info for your system
  sessionInfo()
  ```
  
  