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echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu precise main" | tee -a /etc/apt/sources.list
echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu precise main" | tee -a /etc/apt/sources.list
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EEA14886
apt-get update
apt-get install oracle-java7-installer
exit

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git tag archive/<branchname> <branchname>
git branch -d <branchname>

#checkout archived branch

git checkout -b <branchname> archive/<branchname>

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ssh-keygen -t rsa -C "[email protected]"

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git merge --no-commit --no-ff $BRANCH

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git diff <branch>:<dir>/<filename> <branch>:<div>/<filename>

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git config --global credential.helper cache
git config --global credential.helper 'cache --timeout=43200'

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Z = (X - M) /SD

X = raw score
M = Mean
SD = Std. Deviation

Z-Score is 0 for mean

# of std deviations above or below mean

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Variance = SD^2

SD^2 = [SUM((X-M)^2)]/N

Square the deviation so it doesn't sum to zero

SQRT(SD^2) = SD

SS = SUM of Squares = SUM((X-M)^2
MS = Mean Squares = [SUM((X-M)^2)]/N

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save.image() # save to .RData
load(".RData")

save.image(file="workspace21.RData") #save data to binary
load("workspace21.RData");
save.image()

savehistory() #save to .RHistory in current directory
savehistory(file="workspace.RHistory"); #save history to file

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#given timeframe
mean(timeframe$colname)
sd(timeframe$colname)
describe(timeframe) #table of common summary stats

#filtering
describeBy(impact, impact$condition) #split into separate table based on condition

control <- subset(impact, impact[, 2]=="control") #new timeframe filtered by col 2 == "control"
concussed <- subset(impact, impact[, 2]=="concussed") #new timeframe filtered by col 2 == "concussed"