R: V2 Missile Hits in London

V2 {VGAM} | R Documentation

## V2 Missile Hits in London

### Description

A small count data set. During WWII V2 missiles were fired from the continent mainly towards London. The number of hits per square grid around London were recorded.

### Usage

    data(V2)

### Format

A data frame with the following variables.

hits

  Values between 0 and 3.

ofreq

  Observed frequency, i.e., the number of grids with that many hits.

### Details

The data concerns 408 square grids each of 0.25 square kms about south London (south of the River Thames). They were picked in a rectangular region of 102 square kilometres where the density of hits were roughly uniformly distributed. The data is somewhat comparable to `V1` albeit is a smaller data set.

### Source

Shaw, L. P. and Shaw, L. F. (2019). The flying bomb and the actuary. Significance, 16(5): 12–17.

### See Also

`V1`, `poissonff`.

### Examples

    V2
    mean(with(V2, rep(hits, times = ofreq)))
     var(with(V2, rep(hits, times = ofreq)))
     sum(with(V2, rep(hits, times = ofreq)))
    ## Not run:  barplot(with(V2, ofreq),
              names.arg = as.character(with(V2, hits)),
              main = "London V2 rocket hits",
              col = "lightgreen", las = 1,
              ylab = "Frequency", xlab = "Hits")
    ## End(Not run)

[Package VGAM version 1.1-3 Index]