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authorJohannes Ranke <jranke@uni-bremen.de>2016-09-27 23:00:48 +0200
committerJohannes Ranke <jranke@uni-bremen.de>2016-09-27 23:00:48 +0200
commit12a31f4c130c551f82232d9ef7dfb608bd52c53f (patch)
tree2525ab1ea4102a6edddbd0c2f03f4a851bf2f9c5 /pkg/R/SFO_actual_twa.R
parent0d958ab6f84b569b5437f231c56004890c4ae23b (diff)
Reorganise repository using standard package layout
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-# Copyright (C) 2015 Johannes Ranke
-# Contact: jranke@uni-bremen.de
-# This file is part of the R package pfm
-
-# This program is free software: you can redistribute it and/or modify it under
-# the terms of the GNU General Public License as published by the Free Software
-# Foundation, either version 3 of the License, or (at your option) any later
-# version.
-
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
-# details.
-
-# You should have received a copy of the GNU General Public License along with
-# this program. If not, see <http://www.gnu.org/licenses/>
-
-#' Actual and maximum moving window time average concentrations for SFO kinetics
-#'
-#' @param DT50 The half-life.
-#' @param times The output times, and window sizes for time weighted average concentrations
-#' @export
-#' @author Johannes Ranke
-#' @source FOCUS (2014) Generic Guidance for Estimating Persistence and Degradation
-#' Kinetics from Environmental Fate Studies on Pesticides in EU Registratin, Version 1.1,
-#' 18 December 2014, p. 251
-#' @examples
-#' SFO_actual_twa(10)
-SFO_actual_twa <- function(DT50 = 1000, times = c(0, 1, 2, 4, 7, 14, 21, 28, 42, 50, 100))
-{
- k = log(2)/DT50
- result <- data.frame(actual = 1 * exp(-k * times),
- twa = (1 - exp(-k * times))/(k * times),
- row.names = times)
- return(result)
-}

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