Question

I want to confirm that my data is fit on the Poisson distribution or not. I think I should use qqplot, but I can't figure out how show it by R code

count | frequency |

0 | 229 |

1 | 221 |

2 | 93 |

3 | 35 |

4 | 7 |

7 | 1 |

Answer #1

:Use the following code to plot qqplot

#import excel file of data in R

>D1=read.table("<FileName>.txt",header = TRUE)

Attach(D1)

>ybar=mean(D1)

> p=ncol(D1)

> sig=matrix(nrow=p,ncol=p)

> for(i in 1:p)

+ {

+ for(j in 1:p)

+ {

+ sig[i,j]=cov(D1[,i],D1[,j])

+ }

+ }

> sig

> #to find sample quantiles

> chisq=c()

> for(i in 1:n)

+ {

+ chisq[i]=t(D1[i,]-ybar)%*%solve(sig)%*%(D1[i,]-ybar)

+ }

> chisq

> sq=sort(chisq)

> #to find population quantiles

> i=1:n

> s=(i-0.5)/n

> pq=qchisq(s,p)

> #QQ plot

> plot(sq,pq)

> abline(0,1)

#Output given following

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Frequency
Daily
Weekly
Monthly
Never
I prefer not to Comment
Yes
12
3
1
1
0
No
75
33
7
1
1

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