Miscellaneous Functions for Environmental Analyses

**envalysis** is an R package containing miscellaneous functions for data
analysis in environmental chemistry and ecotoxicology. Provides, for example,
`calibration()`

to calculate calibration curves and corresponding limits of
detection (LODs) and limits of quantification (LOQs) according to German DIN
32645 (2008). `texture()`

makes it easy to estimate soil particle size
distributions from hydrometer measurements (ASTM D422-63, 2007). Some functions
of the package require **ggplot2** or **drc**.

The following functions are available:

- Calculating limits of detection
`lod()`

and limits of quantification`loq()`

as part of the`'calibration'`

class to produce linear calibration curves in accordance with German DIN 32645 (2008); see vignette for details - Calculating concentrations from calibration curves using
`inv_predict()`

- Finding optimum weights for weighted calibrations using
`weight_select()`

- Estimating matrix effects (signal suppression/enhancement) with
`matrix_effect()`

- Determining particle size distributions and soil texture classes (DIN/USDA)
measured with a soil hydrometer in accordance with ASTM D422-63 (2007) using
`texture()`

; see vignette for details - Confidence intervals
`CI()`

, standard errors`se()`

, and root mean square errors`rmse()`

- Various sorption isotherms
`sorption()`

- Categorize water drop penetration times according to Bisdom et al. (1993)
with
`bisdom()`

- Report significant figures, namely round means and errors to the least
significant digit, using
`signifig()`

- Clean, black-and-white ggplot2 theme for scientific publications
`theme_publish()`

; a preview is available here

**envalysis** is available on CRAN and GitHub.

You can install the released version of **envalysis** from
CRAN with:

```
install.packages("envalysis")
```

To install the development version of this package, paste the following code
into your R console (requires **devtools**):

```
if(!require(devtools)) install.packages("devtools")
devtools::install_github("zsteinmetz/envalysis")
```

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