jitterSam

This function is used in cases where there are numerical problems with 
the estimation of the WRTDS model. This mostly happens during bootstrap 
estimation or when the data sets are very large. In order to reduce the 
collinearity in the explanatory variables, some random noise is added to 
the time and log discharge variables in the Sample data frame.

Statistics and graphics for streamflow history,
water quality trends, and the statistical modeling algorithm: Weighted
Regressions on Time, Discharge, and Season (WRTDS).

Laura DeCicco

EGRET

Exploration and Graphics for RivEr Trends

Robert Hirsch

Tim Cohn

David Watkins

Lindsay Carr

Jennifer Murphy

jitterSam function

<dl><dt>Sam</dt>
<dd>data frame with at least columns DecYear and LogQ</dd>
<dt>V</dt>
<dd>a multiplier for the sd of the LogQ jitter. for example V = 0.02,
means that the sd of the LnQ jitter is 0.02*sdLQ</dd></dl>

Arguments

jitter Sample — jitterSam

<dl>

<dt>Sam</dt>
<dd>data frame with at least columns DecYear and LogQ</dd>


<dt>V</dt>
<dd>a multiplier for the sd of the LogQ jitter. for example V = 0.02,
means that the sd of the LnQ jitter is 0.02*sdLQ</dd>

</dl>

jitterSam: jitter Sample

Description

Usage

Value

Arguments

Examples