NSM3 (version 1.5)

pFligPoli: Fligner-Policello

Description

Function to compute the P-value for the observed Fligner-Policello U statistic.

Usage

pFligPoli(x,y=NA,g=NA,method=NA,n.mc=10000)

Arguments

x

Either a list or a vector containing either all or the first group of data.

y

If x contains the first group of data, y contains the second group of data. Otherwise, not used.

g

If x contains a vector of all of the data, g is a vector of 1's and 2's corresponding to group labels. Otherwise, not used.

method

Either "Exact", "Monte Carlo" or "Asymptotic", indicating the desired distribution. When method=NA, "Exact" will be used if the number of permutations is 10,000 or less. Otherwise, "Monte Carlo" will be used.

n.mc

If method="Monte Carlo", the number of Monte Carlo samples used to estimate the distribution. Otherwise, not used.

Value

Returns a list with "NSM3Ch5p" class containing the following components:

m

number of observations in the first data group (X)

n

number of observations in the second data group (Y)

obs.stat

the observed U statistic

p.val

upper tail P-value

two.sided

two-sided P-value

Details

The data entry is intended to be flexible, so that the two groups of data can be entered in any of three ways. For data a=1,2 and b=3,4 all of the following are equivalent:

pFligPoli(x=c(1,2),y=c(3,4)) pFligPoli(x=list(c(1,2),c(3,4))) pFligPoli(x=c(1,2,3,4),g=c(1,1,2,2))

Examples

##Hollander, Wolfe, Chicken Example 4.5 Plasma Glucose in Geese
plasma.glucose<-list(healthy.geese = c(297, 340, 325, 227, 277, 337, 
250, 290), poisoned.geese = c(293, 291, 289, 430, 510, 353, 318
))

pFligPoli(plasma.glucose)