27 Oct
2004
27 Oct
'04
1:27 p.m.
A good question, Sara.
For question 1 and 2(a), you should show some math. For questions 2(b) and
and 3, you should do it in R.
(You can check your math with R and your R with math, if you want, but that
won't be graded.)
----- Original Message -----
From: "Sara Bleich" <bleich(a)fas.harvard.edu>
To: "Olivia Lau" <olau(a)fas.harvard.edu>
Sent: Wednesday, October 27, 2004 5:03 PM
Subject: Clarification
Olivia,
For the problem set, I just wanted to clarify whether we should be writing
down the likelihood functions for the various questions in R or by hand.
If
it is in R, does that apply to the analytic solution for the Poisson?
Thanks.
Sara
27 Oct
27 Oct
1:56 p.m.
New subject: [gov2001-l] sensible percentile
Olivia,
What does the 'sensible percentiles for the contour lines' means?
Any help is appreciated.
Best,
Wei
2:01 p.m.
New subject: [gov2001-l] sensible percentile
Good qestion, Wei.
A sensible percentile just means "Don't use the default R contour lines."
So you can use (for example) 0.01, 0.1, 0.2, 0.3, etc up to 1.0. But just
pick something that makes sense, calculate the percentiles and use those as
your contour lines.
----- Original Message -----
From: "Wei Ha" <weiha(a)fas.harvard.edu>
To: <gov2001-l(a)lists.fas.harvard.edu>du>; "Olivia Lau"
<olau(a)fas.harvard.edu>
Sent: Wednesday, October 27, 2004 5:56 PM
Subject: [gov2001-l] sensible percentile
Olivia,
What does the 'sensible percentiles for the contour lines' means?
Any help is appreciated.
Best,
Wei
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2:08 p.m.
New subject: [gov2001-l] sensible percentile
You can calculate the percentiles easily using the quantile function:
levels <- quantile(z,probs=seq(0,1,0.1))
Then use that in your contour plot:
contour(phi,sigmasq,z,levels=levels)
Olivia Lau wrote:
Good qestion, Wei.
A sensible percentile just means "Don't use the default R contour
lines." So you can use (for example) 0.01, 0.1, 0.2, 0.3, etc up to
1.0. But just pick something that makes sense, calculate the
percentiles and use those as your contour lines.
----- Original Message ----- From: "Wei Ha" <weiha(a)fas.harvard.edu>
To: <gov2001-l(a)lists.fas.harvard.edu>du>; "Olivia Lau"
<olau(a)fas.harvard.edu>
Sent: Wednesday, October 27, 2004 5:56 PM
Subject: [gov2001-l] sensible percentile
Olivia,
What does the 'sensible percentiles for the contour lines' means?
Any help is appreciated.
Best,
Wei
_______________________________________________
gov2001-l mailing list
gov2001-l(a)lists.fas.harvard.edu
http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l
_______________________________________________
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2:26 p.m.
New subject: [gov2001-l] sensible percentile
Thanks, Alex and Olivia. I am trying to find the explanation for 'levels'.
Wei
Quoting Alexander H Montgomery <ahm(a)stanford.edu>du>:
You can calculate the percentiles easily using the
quantile function:
levels <- quantile(z,probs=seq(0,1,0.1))
Then use that in your contour plot:
contour(phi,sigmasq,z,levels=levels)
Olivia Lau wrote:
Good qestion, Wei.
A sensible percentile just means "Don't use the default R contour
lines." So you can use (for example) 0.01, 0.1, 0.2, 0.3, etc up to
1.0. But just pick something that makes sense, calculate the
percentiles and use those as your contour lines.
----- Original Message ----- From: "Wei Ha" <weiha(a)fas.harvard.edu>
To: <gov2001-l(a)lists.fas.harvard.edu>du>; "Olivia Lau"
<olau(a)fas.harvard.edu>
Sent: Wednesday, October 27, 2004 5:56 PM
Subject: [gov2001-l] sensible percentile
_______________________________________________
gov2001-l mailing list
gov2001-l(a)lists.fas.harvard.edu
http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l
Olivia,
What does the 'sensible percentiles for the contour lines' means?
Any help is appreciated.
Best,
Wei
_______________________________________________
gov2001-l mailing list
gov2001-l(a)lists.fas.harvard.edu
http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l
_______________________________________________
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4 comments
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