22 Apr
2012
22 Apr
'12
4:20 p.m.
Hello,
I am wondering how I can get a composite weight from cem_weights and the sampling weight
(the inverse of the probability of a unit to be selected) from my survey data.
Shall I simply use cem_weight*sampling_weight as a new sampling weight? If not, is there
any proper way to deal with it?
I am using STATA. cem_weight is supposed to be used as "iweight" while sampling
weight is supposed to be used as "pweight". I am worried about the compatibility
issue to use cem_weight*sampling_weight as a weight.
Thanks.
Best.
Sifan Zhou
Ph.D. student
Economics Department
University at Albany, SUNY
22 Apr
22 Apr
4:42 p.m.
I believe an "aweight" is used for cem_weight in Stata, not "iweight".
I think the product of the sampling weight and cem_weight should suffice, assuming the
aweight and pweight don't behave differently...
Ariel
-----Original Message-----
From: "Zhou, Sifan" <szhou(a)albany.edu>
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Date: Sun, 22 Apr 2012 20:20:20
To: cem@lists.gking.harvard.edu<cem@lists.gking.harvard.edu>
Subject: [cem] how to incorporate sampling weight with cem_weights?
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10:12 p.m.
Thank you, Ariel.
I was referring to "cem: Coarsened exact matching in Stata"(by Matthew Blackwell
et.al, The Stata Journal 2009), in which iweight is used usually and aweight is used when
we have multiple imputation. Or has that been changed since 2009? If so, could you please
kindly offer me a reference? I hope I can find out how these weights are used in
estimations.
And I did find two weighting method behave differently. For the same cem_weights, using
pweight or iweight gives different results. I will also try aweight.
Sifan
________________________________________
From: ariel.linden(a)gmail.com [ariel.linden(a)gmail.com]
Sent: Sunday, April 22, 2012 4:42 PM
To: Zhou, Sifan; cem-bounces(a)lists.gking.harvard.edu; cem(a)lists.gking.harvard.edu
Subject: Re: [cem] how to incorporate sampling weight with cem_weights?
I believe an "aweight" is used for cem_weight in Stata, not "iweight".
I think the product of the sampling weight and cem_weight should suffice, assuming the
aweight and pweight don't behave differently...
Ariel
-----Original Message-----
From: "Zhou, Sifan" <szhou(a)albany.edu>
Sender: cem-bounces(a)lists.gking.harvard.edu
Date: Sun, 22 Apr 2012 20:20:20
To: cem@lists.gking.harvard.edu<cem@lists.gking.harvard.edu>
Subject: [cem] how to incorporate sampling weight with cem_weights?
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30 Apr
30 Apr
3:47 p.m.
Hi Sifan,
There are many different ways to incorporate weights in Stata routines. For the
"regress" command, "iweight" and "aweight" give the same
result, but, for example, there is no "aweight" option for "logit".
It isn't always clear how Stata uses each of these weights.
You are right that you can simply multiply the two weights together and use
"pweights".
Hope that helps!
Cheers,
matt.
On Sunday, April 22, 2012 at 10:12 PM, Zhou, Sifan wrote:
Thank you, Ariel.
I was referring to "cem: Coarsened exact matching in Stata"(by Matthew
Blackwell et.al, The Stata Journal 2009), in which iweight is used usually and aweight is
used when we have multiple imputation. Or has that been changed since 2009? If so, could
you please kindly offer me a reference? I hope I can find out how these weights are used
in estimations.
And I did find two weighting method behave differently. For the same cem_weights, using
pweight or iweight gives different results. I will also try aweight.
Sifan
________________________________________
From: ariel.linden(a)gmail.com (mailto:ariel.linden@gmail.com) [ariel.linden(a)gmail.com
(mailto:ariel.linden@gmail.com)]
Sent: Sunday, April 22, 2012 4:42 PM
To: Zhou, Sifan; cem-bounces(a)lists.gking.harvard.edu
(mailto:cem-bounces@lists.gking.harvard.edu); cem(a)lists.gking.harvard.edu
(mailto:cem@lists.gking.harvard.edu)
Subject: Re: [cem] how to incorporate sampling weight with cem_weights?
I believe an "aweight" is used for cem_weight in Stata, not
"iweight". I think the product of the sampling weight and cem_weight should
suffice, assuming the aweight and pweight don't behave differently...
Ariel
-----Original Message-----
From: "Zhou, Sifan" <szhou(a)albany.edu (mailto:szhou@albany.edu)>
Sender: cem-bounces(a)lists.gking.harvard.edu (mailto:cem-bounces@lists.gking.harvard.edu)
Date: Sun, 22 Apr 2012 20:20:20
To: cem(a)lists.gking.harvard.edu
(mailto:cem@lists.gking.harvard.edu)<cem@lists.gking.harvard.edu
(mailto:cem@lists.gking.harvard.edu)>
Subject: [cem] how to incorporate sampling weight with cem_weights?
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1 May
1 May
8:41 p.m.
Hello Matt,
Thank you very much!
Sifan
________________________________
From: Matt Blackwell [blackwel(a)fas.harvard.edu]
Sent: Monday, April 30, 2012 3:47 PM
To: Zhou, Sifan
Cc: cem-bounces(a)lists.gking.harvard.edu; cem(a)lists.gking.harvard.edu
Subject: Re: [cem] how to incorporate sampling weight with cem_weights?
Hi Sifan,
There are many different ways to incorporate weights in Stata routines. For the
"regress" command, "iweight" and "aweight" give the same
result, but, for example, there is no "aweight" option for "logit".
It isn't always clear how Stata uses each of these weights.
You are right that you can simply multiply the two weights together and use
"pweights".
Hope that helps!
Cheers,
matt.
On Sunday, April 22, 2012 at 10:12 PM, Zhou, Sifan wrote:
Thank you, Ariel.
I was referring to "cem: Coarsened exact matching in Stata"(by Matthew Blackwell
et.al, The Stata Journal 2009), in which iweight is used usually and aweight is used when
we have multiple imputation. Or has that been changed since 2009? If so, could you please
kindly offer me a reference? I hope I can find out how these weights are used in
estimations.
And I did find two weighting method behave differently. For the same cem_weights, using
pweight or iweight gives different results. I will also try aweight.
Sifan
________________________________________
From: ariel.linden@gmail.com<mailto:ariel.linden@gmail.com>
[ariel.linden@gmail.com<mailto:ariel.linden@gmail.com>]
Sent: Sunday, April 22, 2012 4:42 PM
To: Zhou, Sifan;
cem-bounces@lists.gking.harvard.edu<mailto:cem-bounces@lists.gking.harvard.edu>;
cem@lists.gking.harvard.edu<mailto:cem@lists.gking.harvard.edu>
Subject: Re: [cem] how to incorporate sampling weight with cem_weights?
I believe an "aweight" is used for cem_weight in Stata, not "iweight".
I think the product of the sampling weight and cem_weight should suffice, assuming the
aweight and pweight don't behave differently...
Ariel
-----Original Message-----
From: "Zhou, Sifan" <szhou@albany.edu<mailto:szhou@albany.edu>>
Sender:
cem-bounces@lists.gking.harvard.edu<mailto:cem-bounces@lists.gking.harvard.edu>
Date: Sun, 22 Apr 2012 20:20:20
To:
cem@lists.gking.harvard.edu<mailto:cem@lists.gking.harvard.edu><cem@lists.gking.harvard.edu<mailto:cem@lists.gking.harvard.edu>>
Subject: [cem] how to incorporate sampling weight with cem_weights?
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4 comments
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ariel.linden＠gmail.com -
Matt Blackwell -
Zhou, Sifan