<!doctype s-function-doc system "s-function-doc.dtd" [
<!entity % S-OLD "INCLUDE">
]
>
<s-function-doc>
<s-topics>
<s-topic> lognormRob.control </s-topic>
</s-topics>

<s-title>
Control Parameters for the Robust Lognormal Parameter Estimators
</s-title>

<s-description>
Generates a list of control parameters for the robust lognormal
distribution parameter estimator used in lognormRob.
</s-description>

<s-usage>
<s-old-style-usage>
lognormRob.control(estim, alpha1 = 0.5, alpha2 = 20.5, u = 0.99, beta =
0.4, gam = 0.4, tol = 0.0001, cov = T)
</s-old-style-usage>
</s-usage>

<s-args-required>
<s-arg name=" estim ">
the robust estimator used in lognormRob.  Currently the only choice is
"tdmean" for the truncated mean estimator.  Only the parameters required
for this estimator are returned.
</s-arg>
</s-args-required>


<s-section name="Parameters for the truncated mean">
<descrip>

<tag>alpha1</tag>
the regula falsi procedure (Marazzi and Ruffieux 1999) is applied to the
interval <s-expression>[alpha1, alpha2]</s-expression>.

<tag>alpha2</tag>
see alpha1.

<tag>u</tag>
the value of the tuning constant.

<tag>beta</tag>
value of Beta in the interval <s-expression>[0, 0.5]</s-expression>.

<tag>gam</tag>
value of Gamma in the interval <s-expression>[0, 0.5]</s-expression>.

<tag>tol</tag>
relative precision of alpha, sigma, and the truncation points.

<tag>cov</tag>
if TRUE an estimate of the variance of the mean is computed.
</descrip>
</s-section>

<s-value>
a list containing the control parameters for the estimator specified by
<s-expression>estim</s-expression>.
<s-value>

<s-see>
<s-function name="asymmetricRob.sgm">lognormRob</s-function>.
</s-see>

<s-examples>
<s-example type = text>
lognormRob(los, control = lognormRob.control("tdmean", tol=1e-6))
</s-example>
</s-examples>

<s-keywords>
<s-keyword>librobust</s-keyword>
</s-keywords>

<s-docclass>
function
</s-docclass>

</s-function-doc>
