wilcox.manyzeros.exact

This function gives exact p-values for the Wilcoxon rank sum. This algorithm is designed for the case 
when the responses are either positive or zero, and there are many zero responses. Its purpose is mostly for the 
validation of the <code>choplump</code> function (see <code>vignette("choplumpValidation")</code>).

htest

Calculates permutation tests that can be powerful for comparing two groups with some positive but many zero responses (see Follmann, Fay, and Proschan <DOI:10.1111/j.1541-0420.2008.01131.x>).

Michael Fay

choplump

Permutation Test for Some Positive and Many Zero Responses

wilcox.manyzeros.exact function

<dl> <dt>W</dt>
<dd>a vector of responses, should have some zeros and all rest positive</dd> <dt>Z</dt>
<dd>a vector of group membership, should be either 0 or 1</dd></dl>

Arguments

Author

Wilcoxon Rank Sum Test — wilcox.manyzeros.exact

<dl>

 <dt>W</dt>
<dd>a vector of responses, should have some zeros and all rest positive</dd>

 <dt>Z</dt>
<dd>a vector of group membership, should be either 0 or 1</dd>

</dl>

wilcox.manyzeros.exact: Wilcoxon Rank Sum Test

Description

Usage

Value

Arguments

Author

See Also