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2 changes: 1 addition & 1 deletion 03_GettingData/03_03_creatingNewVariables/index.md
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Expand Up @@ -296,4 +296,4 @@ table(restData2$zipGroups)

* A tutorial from the developer of plyr - [http://plyr.had.co.nz/09-user/](http://plyr.had.co.nz/09-user/)
* Andrew Jaffe's R notes [http://www.biostat.jhsph.edu/~ajaffe/lec_winterR/Lecture%202.pdf](http://www.biostat.jhsph.edu/~ajaffe/lec_winterR/Lecture%202.pdf)
* A nice lecture on categorical and factor variables [http://www.stat.berkeley.edu/classes/s133/factors.html](http://www.stat.berkeley.edu/classes/s133/factors.html)
* A nice lecture on categorical and factor variables [http://www.stat.berkeley.edu/~s133/factors.html](http://www.stat.berkeley.edu/~s133/factors.html)