methodRule1

This is the default function which determines which method to use in <code>choplump</code>.

misc

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

methodRule1 function

<dl> <dt>W</dt>
<dd>numeric vector of response scores, usually many zeros and the rest positive</dd> <dt>Z</dt>
<dd>group membership vector, values all 0 (control) or 1 (treated)</dd> <dt>exact</dt>
<dd>logical, TRUE=exact method, FALSE=approximate method, NULL=see below</dd> <dt>parms</dt>
<dd>numeric value of maximum number of calculations of test statistic, 
if number of calculations greater than parms then use Monte Carlo for exact method</dd></dl>

Arguments

Rule for determining method for choplump function — methodRule1

<dl>

 <dt>W</dt>
<dd>numeric vector of response scores, usually many zeros and the rest positive</dd>

 <dt>Z</dt>
<dd>group membership vector, values all 0 (control) or 1 (treated)</dd>

 <dt>exact</dt>
<dd>logical, TRUE=exact method, FALSE=approximate method, NULL=see below</dd>

 <dt>parms</dt>
<dd>numeric value of maximum number of calculations of test statistic, 
if number of calculations greater than parms then use Monte Carlo for exact method</dd>

</dl>

methodRule1: Rule for determining method for choplump function

Description

Usage

Value

Arguments

Details

See Also