mkin_long_to_wide

This function takes a dataframe in the long form, i.e. with a row for each
observed value, and converts it into a dataframe with one independent
variable and several dependent variables as columns.

Calculation routines based on the FOCUS Kinetics Report (2006,
2014). Includes a function for conveniently defining differential equation
models, model solution based on eigenvalues if possible or using numerical
solvers. If a C compiler (on windows: 'Rtools') is installed, differential
equation models are solved using automatically generated C functions.
Heteroscedasticity can be taken into account using variance by variable or
two-component error models as described by Ranke and Meinecke (2018)
<doi:10.3390/environments6120124>. Hierarchical degradation models can
be fitted using nonlinear mixed-effects model packages as a back end as
described by Ranke et al. (2021) <doi:10.3390/environments8080071>. Please
note that no warranty is implied for correctness of results or fitness for a
particular purpose.

Johannes Ranke

mkin

Kinetic Evaluation of Chemical Degradation Data

Katrin Lindenberger

René Lehmann

Eurofins Regulatory AG 

mkin_long_to_wide function

<dl><dt>long_data</dt>
<dd>The dataframe must contain one variable called "time" with
the time values specified by the <code>time</code> argument, one column called
"name" with the grouping of the observed values, and finally one column of
observed values called "value".</dd>
<dt>time</dt>
<dd>The name of the time variable in the long input data.</dd>
<dt>outtime</dt>
<dd>The name of the time variable in the wide output data.</dd></dl>

Arguments

Author

Convert a dataframe from long to wide format — mkin_long_to_wide

<dl>

<dt>long_data</dt>
<dd>The dataframe must contain one variable called "time" with
the time values specified by the <code>time</code> argument, one column called
"name" with the grouping of the observed values, and finally one column of
observed values called "value".</dd>


<dt>time</dt>
<dd>The name of the time variable in the long input data.</dd>


<dt>outtime</dt>
<dd>The name of the time variable in the wide output data.</dd>

</dl>

mkin_long_to_wide: Convert a dataframe from long to wide format

Description

Usage

Value

Arguments

Author

Examples