RinAction - R Data Structure - DataFrame

gistfile1.r

#################################
#           Data Frame          #
#################################

# Creating a dataframe
patientID <- c(1, 2, 3, 4)
age <- c(25, 34, 28, 52)
diabetes <- c("Type1", "Type2", "Type1", "Type1")
status <- c("Poor", "Improved", "Excellent", "Poor")
patientdata <- data.frame(patientID, age, diabetes, status)
patientdata

# Specifying elements of a dataframe

patientdata[1:2]
patientdata[c(2,4)]
patientdata[c("diabetes", "status")]
patientdata$age

# Using factors

patientID <- c(1, 2, 3, 4)
age <- c(25, 34, 28, 52)
diabetes <- c("Type1", "Type2", "Type1", "Type1")
status <- c("Poor", "Improved", "Excellent", "Poor")
diabetes <- factor(diabetes)
status <- factor(status, order = TRUE)
patientdata <- data.frame(patientID, age, diabetes, status, row.names=patientID)
str(patientdata)
summary(patientdata)