Section 37 Data Analysis: Summary Statistics

  • Read the help file for the different functions to create summary statistics of the data.

  • Calculate mean and median of the numeric data.

  • Explore the help for the function fivenum. Apply the function.

  • Calculate the quartile of the numeric data.

  • Calculate variance and standard deviation of the numeric data

  • Calculate range, inter-quartile range and coefficient of variation

  • Obtain the counts for each level of Sex factor

  • Obtain the counts for each level of Vac factor

  • Obtain the counts for combination of Sex & Vac factors

  • Calculate the correlation between Age and Wt



37.1 Summary Statistics

mean(DF$Wt, na.rm=TRUE)

median(DF$Wt, na.rm=TRUE)

fivenum(DF$Wt, na.rm=TRUE)

range(DF$Wt, na.rm=TRUE)

quantile(DF$Wt, probs = c(0.25, 0.50, 0.75), na.rm = TRUE)

IQR(DF$Wt, na.rm = TRUE)

sd(DF$Wt, na.rm = TRUE)

sd(DF$Wt, na.rm = TRUE)/mean(DF$Wt, na.rm=TRUE)

table(DF$Sex)
sum(DF$Sex == 'M')
sum(DF$Sex == 'F')

table(DF$Vac)

with(data=DF, table(Sex, Vac))

with(data=DF, cor(Age, Wt, use = 'complete.obs'))