envalysis

envalysis is an R package containing miscellaneous functions for data analyses in environmental chemistry and ecotoxicology. Provides, e.g., calibration() to calculate calibration curves and corresponding limits of detection (LODs) and quantification (LOQs) according to German DIN 32645:2008-11. texture() makes it easy to estimate soil particle size distributions from hydrometer measurements (ASTM D422-63(2007)e2). Some functions of the package require ggplot2 or drc.

Functions

Currently, the following functions are available:

Data manipulation and analysis

• Confidence intervals CI()
• Root mean square errors rmse()
• Limit of detection (LOD) lod() and limit of quantification (LOQ) loq() as part of the calibration class to make linear calibration curves according to German DIN 32645:2008-11
• Various sorption isotherms sorption()
• Determine particle size distributions and soil texture classes (DIN/USDA) measured with a soil hydrometer in accordance with ASTM D422-63(2007)e2 using texture(); see vignette for details

Data presentation

• Categorize water drop penetration times according to Bisdom et al. (1993) bisdom()
• Report significant figures, i.e. round means and erros to the least significant digit, using signifig()
• Clean, black-and-white ggplot2 theme for scientific publications theme_publish(); a preview is available here

Installation

envalysis is available on github. To install the package, paste the following code into your R console (requires devtools):

if (!'devtools' %in% installed.packages()[,'Package']) install.packages('devtools')
devtools::install_github('zsteinmetz/envalysis')
require(envalysis)