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t-student/ddplyr_df_summary.R

Last active October 14, 2015 05:56
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ddplyr_df_summary.R
# Create a data frame from a grouped summary of a response variable
library(plyr)
df <- ddply(df1, .(age.level, gender), summarise, m.mean = mean(sbp), s.sum = sum(sbp))
# age.level gender m.mean s.sum
# 1 age<40 Female 131.1082 786.6491
# 2 age<40 Male 134.8499 539.3997
# 3 age>=40 Female 142.3465 711.7324
# 4 age>=40 Male 143.8150 1294.3354
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