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<HTML><HEAD> <TITLE> $ttdf.ctl</TITLE><HEAD>
<BODY BGCOLOR="#FFFFFF">
<PRE>
+--------------------------------------------------------------------+
| |
| $TTDF (NM75) |
| |
+--------------------------------------------------------------------+
MEANING: Specifies t-distribution degrees of freedom for theta
CONTEXT: NM-TRAN Control Record
USAGE:
$TTDF 0 (default)
$TTDF [value ... ]
$TTDF [(value)[xn]] ...
SAMPLE:
$TTDF (2.0)x2 (3.0)x2
sets t-distribution degrees of freedom for thetas 1 and 2 to value of
2, and degrees of freedom for thetas 3 and 4 to value of 3.0.
DISCUSSION:
The ttdf is a separate record that allows the user to specify the t-
distribution degrees of freedom for each theta. It can be used with
$ESTIMATION METHOD=NUTS, and with $SIMULATION. By default $TTDF value
is 0. These values will be used in estimation and simulation unless
$EST TTDF or $SIM TTDF is set, respectively, which set the t degrees
of freedom to a single TTDF value for all thetas for that step.
REFERENCES: Guide IV Section <a href="IV/V.html#C.3.">V.C.3<a/>, <a href="IV/V.html#C.10.">V.C.10<a/>
REFERENCES: Guide VI Section <a href="VI/VI.html#D.">VI.D<a/>, <a href="VI/fig.html#Figure_41">Figure 41<a/>
<pre>Go to <A HREF=index.html>main index</A>.</pre>
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<i><font size=-1>Created by nmhelp2html v. 1.0 written by Niclas Jonsson (Modified by AJB 5/2006,11/2007,10/2012)</font>
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