Gov2001

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3278 discussions

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observations. This rate is held constant in Poisson, but varies in Negative Binomial. Can we interpret the value of lambda literally, i.e. lambda = 1 --> one event per time period, lambda = 10 --> ten observations per time period, etc? I guess we need to understand this to select an appropriate range for lambda.. Thanks, Stan **************************** Stanislav Markus Ph.D. Candidate Harvard University Department of Government e: smarkus(a)fas.harvard.edu t: 617.513.5407 -----Original Message----- From: gov2001-l-admin(a)fas.harvard.edu [mailto:gov2001-l-admin@fas.harvard.edu] On Behalf Of Kosuke Imai Sent: Wednesday, February 26, 2003 11:27 AM To: Olivia Lau Cc: gov2001-l(a)fas.harvard.edu Subject: Re: [gov2001-l] Problem 4 You are right that gamma is a continuous distribution. So, you have to discretize it by creating a sequence of values for an appropriate range of lambda. Then, you can create a matrix (in R) where its i,j element represents the joint density evaluated at the ith value of Y and the jth value of lambda. Now, if you sum over the column (or "scoop" to use Gary's word), you will obtain the marginal density of Y. Is that clear now? Kosuke On Wed, 26 Feb 2003, Olivia Lau wrote: > I think that the confusion is this: If lambda is distributed > according to the gamma (continuous) distribution, how can we > "construct a matrix"? Do you really want us to construct an > actual matrix (in R), for which (I think) we would need to > evaluate the poisson distribution at specific values of lambda, > or do you just want us to do it theoretically and integrate to > get the marginal density over some range of y? > > Am I still lost? > > Thanks, Olivia. > > ----- Original Message ----- > From: "Kosuke Imai" <kimai(a)fas.harvard.edu> > To: <gov2001-l(a)fas.harvard.edu> > Sent: Wednesday, February 26, 2003 9:57 AM > Subject: [gov2001-l] Problem 4 > > > > A number of people have asked questions about problem 4 last > night. Here > > is a basic idea. You want to evaluate the "joint" density with > different > > values of y and lambda where y is poisson and lambda is gamma. > This is the > > joint density function, so you are not drawing random > variables from any > > distribution. you are simply evaluating the height of the > density. To do > > this, you need to create a matrix where its row and column > represents y > > and labmda, respectively. Then, to integrate out lambda, you > want to sum > > over the column. After normalizing it, this gives you the > marginal > > density of negative binomial. > > > > Kosuke > > > > _______________________________________________ > > gov2001-l mailing list > > gov2001-l(a)fas.harvard.edu > > http://www.fas.harvard.edu/mailman/listinfo/gov2001-l > > > > _______________________________________________ > gov2001-l mailing list > gov2001-l(a)fas.harvard.edu > http://www.fas.harvard.edu/mailman/listinfo/gov2001-l > _______________________________________________ gov2001-l mailing list gov2001-l(a)fas.harvard.edu http://www.fas.harvard.edu/mailman/listinfo/gov2001-l

3 years, 2 months

Question on pcse using corr(ar1) in R

by Benjamin Andrew Singer

Hello, I have a question about implementing regressions in R with panel corrected standard errors with a correction for autocorrelation between the error terms. The reason I am reaching out to you is because I came across a resource online dated from a while back <https://lists.gking.harvard.edu/pipermail/gov2001/2008-April/001938.html> when you indicated "We are still working on a function that does PCSE AND AR(1) correction AND works for unbalanced panels (right now we only have the first two)." My question is, what progress has been made on such a program/package in R? My goal is to adapt an analysis I performed in Stata that took the form of "xtpcse [depvar] [indvars], corr(ar1)". When I used the pcse package in R, I received an error message stating that "Length of groupN and groupT must equal nrows of using data", which I believe indicates that my panels were unbalanced. Sorry for contacting you out of the blue, but I thought maybe you knew of a quick solution given your post in the hyperlink above. Thanks. Ben

8 years, 11 months

Computing residuals and predicted values using "logit.survey" and "weights" in Zelig R package

by Barankanira Emmanuel

Dear Users, I'm using the Zelig package in R to predict the HIV prevalence. In others words, I want to estimate the model that regresses the HIV status (HIV+ or HIV-) on the sex (male, female). I have a problem of getting the residuals and the predicted values of the models with and without covariates respectively : resu1 <- zelig(HIV~1,model = "logit.survey",weights = ~Weight,data=PREVATOUT) resu2 <- zelig(HIV~Sex,model = "logit.survey",weights = ~Weight,data=PREVATOUT) where HIV is a dichotomous indicator (HIV=0 or HIV=1), Weight is the survey sampling weight, Sex (Sex=1 for men and Sex=2 for female) and PREVATOUT is my dataset containing other covariates. How can I get the residuals and the predicted values of the models? Any idea? Thanks. *************************************** Emmanuel BARANKANIRA Phone : (+33)623575806 E-mail : baremma2002(a)yahoo.fr France ***************************************

10 years, 1 month

umbrella left in section

by Molly Roberts

Hi everyone, Someone left their black umbrella in section tonight. If that was your umbrella -- let me know -- I have it. Best, Molly _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

12 years, 7 months

Applied Statistics Workshop

by Konstantin Kashin

Hello Gov 2001 Alumni! I hope everyone has had a relaxing summer and is enjoying what’s left of it! I am the new graduate student coordinator for the Applied Statistics Workshop (Gov 3009) at IQSS and would like to invite all of you to attend the workshop. The workshop features a multidisciplinary forum for presenting research with statistical innovations and applications. Starting with Wednesday, Sept. 7, we will meet every Wednesday from 12-1:30 pm in CGIS-Knafel 354 (1737 Cambridge Street). As always, lunch will be provided. Please note that you don’t have to formally enroll in the workshop to attend. The schedule for the semester will be available shortly at http://www.iq.harvard.edu/events/node/1208. Furthermore, if you would like your name to be added to the mailing list, please let me know. My apologies to those who have received this announcement through the gov grads listserv also. Thank you, Konstantin -- Konstantin Kashin Ph.D. Student in Government Harvard University Mobile: 978-844-0538 E-mail: kkashin(a)fas.harvard.edu Site: http://people.fas.harvard.edu/~kkashin/ _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

12 years, 8 months

Error Question

by Julie Faller

Hello to anyone who is still reading this, I am working with elections data in which I have the votes a candidate received but not if they won or not. I want to add a couple columns to my dataset just noting if the candidate won and by how much. I feel like this should be easy. And yet… Here is what I've done length(unique(data$constituency)) mat<-as.vector(unique(data$constituency)) for(i in 1:229){ sub<-data[data$constituency==mat[i],] ordered<-sub[order(sub[,"vote"], decreasing=TRUE),] win<-ordered[1,] second<-ordered[2,] totalvotes<-sum(sub[,"vote"]) winvote<-win[,"vote"] secvote<-second[,"vote"] margin<-winvote-secvote pcntmarg<-as.numeric(margin/totalvotes) data[data[,"name"]==win[,"name"],]$marginwin[]<-pcntmarg data[data[,"name"]==win[,"name"],]$elected[]<-1 } Resulting in these errors: Error in `$<-.data.frame`(`*tmp*`, "marginwin", value = numeric(0)) : replacement has 0 rows, data has 1 Any words of wisdom? Thanks from Ghana!! Julie _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

12 years, 11 months

Fwd: First opinion-- consulting assistance.

by Gary King

Hi Gang, here's an interesting project for anyone interested in health policy. Please contact Lory directly if you're interested. Gary -- *Gary King* - Albert J. Weatherhead III University Professor - Director, IQSS - Harvard University GKing.Harvard.edu <http://gking.harvard.edu/> - King(a)Harvard.edu - @kinggary<http://twitter.com/kinggary>- 617-500-7570 - Asst 495-9271 - Fax 812-8581 ---------- Forwarded message ---------- From: Lory Wallach <lwallach(a)firstopinion.com> Date: Fri, May 20, 2011 at 12:27 PM Subject: Re: First opinion-- consulting assistance. To: Gary King <king(a)harvard.edu> Hi Gary The First Opinion is a medical knowledge-based system designed to give medical advice to the general public and decision support to clinicians. The System is web-based and can be accessed through any internet browser, smart phone or dumb phone through interactive voice response and automatic speech recognition technologies in most languages. Using an Internet based authoring approach; the First Opinion system encodes a highly useful core of expert and general practitioner diagnostic and treatment knowledge into a computer system that can be accessed by clinically trained individuals as well as by any individual consumer. The System has two different front ends that support both of these audiences. The System has the ability to consider every disease of mankind (24,000) for anyone seeking consultation For patients-- this provides free and easy access to diagnosis-- and answers the questions-- what is wrong with me... what is my next best step for care, was the diagnosis made by my provider correct. For providers-- it acts as a clinical decision support system especially for those that do not have access to that through an EMR. We are seeking consulting help to size the global market. We know it is huge-- and we want to put some measures around that. This could include what is the gap in the global capacity to make a medical diagnosis, what is the demand for receiving a correct and timely diagnosis, what is the cost of incorrect or delayed diagnosis, what is the potential reduction in pain and suffering, what is the impact on freeing up capacity so that health care resources can be used more effectively? Thank you for sharing this request for consultative services with your capable students and colleagues. Best, Lory Wallach 858-733-2145 _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

12 years, 11 months

weights

by Leslie Finger

Hi Class, Sorry for the harassment far after the end of class. I'm using survey data with weights and, if I use matching and readjust my quantity of interest to the average treatment effect on the treated, should I still be using survey weights? My inclination is that the answer is no, especially since I might be using the weights from matching in the regression. Any help is much appreciated! Best, Leslie p.s. if any of you have ever used "svydesign" in R, I'm trying to figure out what exactly i'm supposed to put for "id"... _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l -- gov2001 mailing list served by Harvard-MIT Data Center List Address: gov2001(a)lists.gking.harvard.edu Subscribe/Unsubscribe: http://lists.gking.harvard.edu/?info=gov2001

12 years, 11 months

Evaluations

by Brandon Stewart

Gov 2001, I've been asked by the Extension School to remind all extension school students that evaluations are due on Monday. Please fill them out they are extremely important to us! (I am pretty sure everyone else has an extra week, but be sure to do them!) Brandon _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

12 years, 11 months

Fwd: Public Law & Political Science Conference

by Gary King

IQSS is sponsoring what looks like will be a great conference on political economy and the law. in case you're interested, pls see the attached. Gary _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

12 years, 11 months

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