Created
April 16, 2012 18:07
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RinAction - R Data Structure - DataFrame
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| ################################# | |
| # 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) |
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