bombhits: Number of bomb hits in London during World War II

In ipsRdbs: Introduction to Probability, Statistics and R for Data-Based Sciences

Number of bomb hits in London during World War II

Description

Number of bomb hits in London during World War II

Usage

bombhits

Format

A data frame with two columns and six rows:

numberhit

The number of bomb hits during World War II in each of the 576 areas in London.

freq

Frequency of the number of hits

Source

\insertCite

bombhits;textualipsRdbs.

Examples

 summary(bombhits)
 # Create a vector of data 
 x <- c(rep(0, 229), rep(1, 211), rep(2, 93), rep(3, 35), rep(4, 7), 5)
 y <- c(229, 211, 93, 35, 7, 1) # Frequencies 
 rel_freq <- y/576
 xbar <- mean(x)
 pois_prob <- dpois(x=0:5, lambda=xbar)
 fit_freq <- pois_prob * 576
  #Check 
  cbind(x=0:5, obs_freq=y, rel_freq =round(rel_freq, 4),  
  Poisson_prob=round(pois_prob, 4), fit_freq=round(fit_freq, 1))
  obs_freq <- y
  xuniques <- 0:5
  a <- data.frame(xuniques=0:5, obs_freq =y, fit_freq=fit_freq)
  barplot(rbind(obs_freq, fit_freq), 
  args.legend = list(x = "topright"), 
  xlab="No of bomb hits",  
  names.arg = xuniques,  beside=TRUE, 
  col=c("darkblue","red"), 
  legend =c("Observed", "Fitted"), 
  main="Observed and Poisson distribution fitted frequencies 
  for the number of bomb hits in London")

ipsRdbs documentation built on May 29, 2024, 4:15 a.m.