From: VAFadeyev@lbl.gov
Date: Mon Oct 20 2003 - 01:35:20 PDT
Ariel,
This is what I see for z=1.2:
Input stretch is 1.0 . The average fitted
value from 25 simulations is 1.16 . There are
two large positive outliers. After clipping
the average becomes 1.04 .
This suggests that if there is some bias,
it may not be in the same direction as yours
(on the plots you sent the average stretch < 1
for z=1.2).
The existence of the outliers is a bit worrisome;
also, there are cases with abonormally small
fit errors.
vitaliy
----- Original Message -----
From: VAFadeyev@lbl.gov
Date: Monday, October 20, 2003 1:12 am
Subject: Re: Optimization of observations for the HST search
>
>
> Hi Ariel,
>
> it is good that the results are consistent.
>
> Your observation of the biases is very interesting. Was it ever
> checked before that the LC parameter
> extraction is self-consistent and bias-free, say
> for lower redshift cases?
>
> The only reason why I switched off the randomization
> was to save time. Otherwise I'd have to rerun
> the code multiple times for every observation
> sequence, derive the corresponding distributions etc.
>
> Initially I did briefly checked that with randomization turned on
> there were no big biases
> for z=1.3. This is close to your case of z=1.4,
> where you don't have substantial biases either.
> So perhaps this was not a very strict check.
> Am rerunning that example for z=1.2 now. Will
> report the results shortly.
>
> Cheers,
> vitaliy
>
>
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