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Answers and rating deltas for

for each group summarise means for all variables in dataframe (ddply? split?)

Author Votes Δ
Dirk Eddelbuettel 9 +0.33
Thierry 9 +3.08
JD Long 7 +1.12
Marek 5 -1.22
Shane 4 -3.14
John 2 0.00
Last visited: Sep 14, 2014, 5:07:29 AM