Exercise 1 - Introduction to Probability theory

These exercises cover the sections of LMS_Statistics

Set working directory

# Set working directory
setwd("/Volumes/bioinfomatics$/jurtasun/Courses/CBW2022/LMS_Statistics/course/exercises")
getwd()

## [1] "/Volumes/bioinfomatics$/jurtasun/Courses/CBW2022/LMS_Statistics/course/exercises"

Basic data manipulation in R

• read.csv() - load input file in .csv format
• head() - check first rows of a dataframe
• dim() - check dimensions of a dataframe
• str() - check data types of an R object

Basic statistics in R

• mean(): generate Binomial distributed random variables with a given mean and std
• sd(): generate Poisson distributed random variables with a given mean and std
• var(): generate Normal distributed random variables with a given mean and std

Exercise 1

• Read in the file data/life_expectancy_at_birth.csv and store it as a dataframe

• Use the head() and dim() functions to show the first 6 rows of the data. How many variables are there?

• Use the str() and summary() functions to see the data type and summary information of the dataset

• How many males and females are in the area of England?

• Check maximum and minimum life expectancy in England

• Find the the median life expectancy of of Males and Females in England

• Get the the quantiles of life.expectancy in Wales, N.Ireland, and Scotland, respectively

• Get the mean, variance and standard deviation of the life.expectancy in England