A collection of websites of interest:

Center for Research Methods & Data Analysis at Kansas University:
http://crmda.ku.edu

Kris Preacher at Vanderbilt University:
http://www.quantpsy.org/

Judea Pearl
http://bayes.cs.ucla.edu/jp_home.html

Applied missing data by Craig Enders
http://www.appliedmissingdata.com/

Mostly harmless econometrics
http://www.mostlyharmlesseconometrics.com/

Kosuke Imai at Princeton University
http://imai.princeton.edu/

DataCamp Online Classes
https://www.datacamp.com