overlapptest (version 1.4)

pval: P Value for a Monte Carlo Test of Polygon Overlapping

Description

Computes the p-value and sign of deviation for the hypothesis that the first value in a vector is larger or smaller (i.e., a two-sided test) than the expected value represented by all the other values in the vector, or alternatively, computes a one-sided test.

Usage

pval(x, alternative=c("two.sided", "less", "greater"))

Value

Vector of length one whose absolute value represents the p-value and whose sign indicates wether the first value in x is larger (positive) or smaller (negative) than the expected value.

Arguments

x

A vector, usually with some observed statistic in the first position (the observed overlapp) followed by a sequence of the same statistic computed for several realizations of a null model against which we test our hypothesis (i.e., a sequence of simulated, i.e., rotated, overlapps).

alternative

a character string specifying the alternative hypothesis, must be one of "two.sided" (default), "greater" or "less". You can specify just the initial letter.

Author

Marcelino de la Cruz

Examples

pval(c(0,1:99))
pval(c(100,1:99))
pval(c(100,1:199))
pval(c(200,1:199))
pval(c(0,1:199))