Displaying 2 results from an estimated 2 matches for "tau_".
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tau
2007 Aug 07
0
Automatic implementation of "trivial" constraints in optimization
...$p_{fast}+p_{slow}=1$. In addition we could want to
enforce $A>0$, say, because our signal corresponds physically to a
concentration and for ease of interpretation having $t_{fast} < t_{slow}$
would not hurt. We could then reparametrize our problem with:
$A = \exp (\alpha)$
$t_{fast} = \exp (\tau_{fast})$
$t_{slow} = t_{fast} + \exp (\tau_{slow})$
$p_{fast} = 0.5 + 0.5 \frac{\pi_{fast}}{\sqrt{1+\pi_{fast}^2}}$
$p_{slow} = 1 - p_{fast}$
and the four parameters: $\alpha, \tau_{fast}, \tau_{slow}, \pi_{fast}$
would be unconstrained.
One could then think of allowing "optim" users to sp...
2003 Jan 31
2
Testing ``<=" in R
Hello,
I've encountered the following:
> n_500
> tau_.95
> (n*(1-tau))
[1] 25
> (n*(1-tau))<=25
[1] FALSE
> (n*(1-tau))==25
[1] FALSE
I'm using UNIX R Version 1.4.0, and also tested in out in Windows 1.6.0. Is
this a bug?
Masha