27 Mar
2013
27 Mar
'13
6:15 p.m.
Hi Immanuel,
OK - I wasn't really making a proposal - just trying to understand what you
were proposing.
So for a jackknife I propose (B2_1 - B2_2) x (Keck_1 -
Keck_2).
But don't we expect this to be clean given that we already think (B2_1 - B2_2)
x (B2_1 - B2_2) and (Keck_1 - Keck_2) x (Keck_1 - Keck_2) are clean? Is the
thinking that by getting rid of noise bias (squared) terms other things may be
easier to see?
Clem
--
**********************************************************************
Clem Pryke - Associate Professor - Physics
University of Minnesota,
Room 313 Tate, 116 Church Street S.E. Minneapolis, MN, 55455
Tel: 612-624-7578 Fax: 612-624-4578 email: pryke(a)physics.umn.edu
**********************************************************************
27 Mar
27 Mar
6:35 p.m.
New subject: Decisions from B2/pipeline telecon
But don't we expect this to be clean given that
we already think (B2_1 -
B2_2)
x (B2_1 - B2_2) and (Keck_1 - Keck_2) x (Keck_1 - Keck_2) are clean?
Certainly, and I have a hard time thinking of an effect that would show up
in the cross spectra but is invisible in the auto spectra. (But there could
always be surprises.) My thinking is more that the cross spectra have
independent statistical power and jackknives are always limited by
statistics. So if there is an effect at the borderline of being detectable
in the B2 alone jack, then the cross spectra jack can add to the total
statistical power we can bring to bear on it. I wasn't actually thinking
about the noise bias in this respect, but that's a good point too.
Immanuel Buder
Postdoctoral Fellow
Harvard-Smithsonian Center for Astrophysics
(office) 617 495 7567
(office) 160 Concord Ave., M-114C
(mail) 60 Garden St. MS 42
Cambridge, MA 02138
ibuder(a)cfa.harvard.edu
On Wed, Mar 27, 2013 at 6:15 PM, Clem Pryke <pryke(a)physics.umn.edu> wrote:
Hi Immanuel,
OK - I wasn't really making a proposal - just trying to understand what you
were proposing.
So for a jackknife I propose (B2_1 - B2_2) x
(Keck_1 - Keck_2).
But don't we expect this to be clean given that we already think (B2_1 -
B2_2)
x (B2_1 - B2_2) and (Keck_1 - Keck_2) x (Keck_1 - Keck_2) are clean? Is the
thinking that by getting rid of noise bias (squared) terms other things
may be
easier to see?
Clem
--
**********************************************************************
Clem Pryke - Associate Professor - Physics
University of Minnesota,
Room 313 Tate, 116 Church Street S.E. Minneapolis, MN, 55455
Tel: 612-624-7578 Fax: 612-624-4578 email: pryke(a)physics.umn.edu
**********************************************************************
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