Merge pull request #10 from KellyBlack/dev

Dev
R simulation update
Merge pull request #8 from KellyBlack/dev

Dev
R simulation update
adding more info to presentation
Merge pull request #25 from lindongzhou/linton_dev

Linton dev
Merge pull request #26 from candaceliu/candace_dev

Candace dev
mean and variance vectors
Merge pull request #27 from candaceliu/candace_dev

mean and variance vectors