Dstart

This function determines the starting values for estimation of parameters in the water retention models. The input data must contain at least the x (suction potential) and y(moisture contents) variables. It gives the starting values as close to the expected estimates as possible.

 models

 manip 

Contains functions for estimating the parameters of infiltration and water retention models using the curve-fitting methods as discussed in Omuto and Gumbe (2009) ("Estimating water infiltration and retention characteristics using a computer program in R"<doi:10.1016/j.cageo.2008.08.011>). The models considered are those that are commonly used in soil science. Version 2 of the package has new models for water retention characteristic curves.

Christian Thine Omuto

HydroMe

Estimating Water Retention and Infiltration Model Parameters
using Experimental Data

Dstart function

<dl> <dt>data</dt>
<dd>This is the water retention data with at least x (suction potential) and y(moisture contents) variables. The number of rows of the data should be at least 4 entries/levels of suction potential</dd></dl>

Arguments

Author

Determine starting values for nonlinear parameter estimation in the water retention models — Dstart

<dl>

 <dt>data</dt>
<dd>This is the water retention data with at least x (suction potential) and y(moisture contents) variables. The number of rows of the data should be at least 4 entries/levels of suction potential</dd>

</dl>

Dstart: Determine starting values for nonlinear parameter estimation in the water retention models

Description

Usage

Value

Arguments

Author

Details

See Also

Examples