confint.pumping_test: confint.pumping_test

In khaors/pumpingtest: R Package for the analysis and evaluation of pumping tests

Description

Calculates the confindence intervals of the hydraulic parameters, drawdown and its derivative by bootstrapping the residuals

Usage

## S3 method for class 'pumping_test'
confint(object, parm, level = 0.95, ...,
  slug = FALSE, method = "wald", d = 20, neval = 100,
  seed = 12345)

Arguments

object	An estimated pumping_test object
parm	Name of parameters to be analyzed
level	A numeric vector with the probabilities used to calculate the confidence intervals.
...	additional argument(s) for methods.
slug	Logical flag to indicate a slug test.
method	A character string with the method to estimate the confidence intervals. The methods currently supported are: wald bootstrap jackniffe .
d	Number of points used in the calculation of the derivative.
neval	Number of bootstrap realizations used in the estimation of confidence intervals.
seed	Random seed.

Value

In the case of method=wald the function returns a list with the following entries:

• hydraulic.parameters.names: A character vector with the names of the hydraulic parameters

• hydraulic.parameters.ci: Confidence intervals of the hydraulic parameters

In the case of method=bootstrap the function returns a list with the following entries:

• fit.parameters: A matrix with the values of the parameters of the nonlinear regression model

• total.drawdown: A matrix with the values of the drawdown

• total_dsdlogt: A matrix with the values of the derivative of drawdown

• sci: A matrix with the confidence intervals of drawdown

• dsci: A matrix with the confidence intervals of the derivative of drawdown

• hydraulic.parameters: A matrix with the hydraulic parameter estimated from the boostrapp realizations

• parameter.names: A vector with the name of the fitting parameters

• hydraulic.parameters.names: A character vector with the names of the hydraulic parameters

• hydraulic.parameters.ci: Confidence intervals of the hydraulic parameters

Author(s)

Oscar Garcia-Cabrejo [e-mail]

See Also

Other base functions: additional.parameters<-, confint_bootstrap, confint_jackniffe, confint_wald, estimated<-, evaluate, fit.optimization, fit.parameters<-, fit.sampling, fit, hydraulic.parameter.names<-, hydraulic.parameters<-, model.parameters, model<-, plot.pumping_test, plot_model_diagnostic, plot_sample_influence, plot_uncert, print.pumping_test, pumping_test, simulate, summary.pumping_test

Examples

data(theis)
ptest.theis <- pumping_test("Well1", Q = 1.388e-2, r = 250, t= theis$t, s = theis$s)
ptest.theis.fit <- fit(ptest.theis, "theis")
hydraulic.parameters(ptest.theis) <- ptest.theis.fit$hydraulic_parameters
fit.parameters(ptest.theis) <- ptest.theis.fit$parameters
model(ptest.theis) <- "theis"
estimated(ptest.theis) <- TRUE
ptest.theis.ci1 <- confint(ptest.theis, level = 0.975)
ptest.theis.ci2 <- confint(ptest.theis, level = c(0.025, 0.975), method = 'bootstrap',
 d = 20, neval = 100)

khaors/pumpingtest documentation built on Nov. 15, 2019, 8:10 p.m.