baseDay

Computes the base day of the year, a reference value that can be 
used to group days for the computation of summary statistics. From smwrBase package.

manip

internal

Enable users to evaluate long-term trends using a Generalized
Additive Modeling (GAM) approach. The model development includes selecting a
GAM structure to describe nonlinear seasonally-varying changes over time,
incorporation of hydrologic variability via either a river flow or salinity,
the use of an intervention to deal with method or laboratory changes
suspected to impact data values, and representation of left- and
interval-censored data. The approach has been applied to water quality data
in the Chesapeake Bay, a major estuary on the east coast of the United
States to provide insights to a range of management- and research-focused
questions. Methodology described in Murphy (2019)
<doi:10.1016/j.envsoft.2019.03.027>.

Erik Leppo

baytrends

Long Term Water Quality Trend Analysis

baseDay function

<dl><dt>x</dt>
<dd>a vector of class POSIXt, Dates, or character that represents a
date. Missing values are permitted.</dd>
<dt>numeric</dt>
<dd>a logical value; <code>TRUE</code> means return the numeric value
of the day, <code>FALSE</code> means return a factor.</dd>
<dt>year</dt>
<dd>a character string indicating the basis of the factor levels. See
Details.</dd></dl>

Arguments

Base Day — baseDay

<dl>

<dt>x</dt>
<dd>a vector of class POSIXt, Dates, or character that represents a
date. Missing values are permitted.</dd>


<dt>numeric</dt>
<dd>a logical value; <code>TRUE</code> means return the numeric value
of the day, <code>FALSE</code> means return a factor.</dd>


<dt>year</dt>
<dd>a character string indicating the basis of the factor levels. See
Details.</dd>

</dl>

baseDay: Base Day

Description

Usage

Value

Arguments

Details

Examples