Gov2001 February 2008

gov2001@lists.gking.harvard.edu

44 participants
62 discussions

[gov2001-l] Typo in PS3, Q2a?

by william5＠fas.harvard.edu

Question 3, part a reads "if x < pi/2 or x > pi/2" Should the problem in read "if x < - pi/2 or x > pi/2" or do we only need to evaluate exactly where x=pi/2 and all else? Joe

16 years, 2 months

[gov2001-l] Problem Set 1

by orgeldi＠yahoo.de

Dear Jenn, please find my solutions for task 1. I still have no access to the dropbox, but already got my HUID number. I supppose you are 5 to 6 hours behind in Boston. Thus 10 pm MEZ should be 5 pm your time. Regards and best wishes from Germany- Joerg Lesen Sie Ihre E-Mails jetzt einfach von unterwegs. www.yahoo.de/go

16 years, 2 months

[gov2001-l] problem 2

by keith.schnakenberg＠gmail.com

Classmates, I am trying to avoid over-using the list, but I am not working with anyone and I don't know people who know this stuff, so this is the only form of collaboration available to me. I am working on problem 2, and I'm struggling with how to vary the sample size appropriately. Here is what I've been doing: sims <- 100000 alldays <- seq(1, 365, 1) for (i in 1:sims){ room <- sample(alldays, sample(20:100), replace=TRUE) size <- length(room) same <- x[duplicated(room)] 3same <- length(same) - length(unique(same)) } I am getting syntax errors, but you can see the logic of what I'm trying to do--I'm drawing random samples of random size and then storing the length and the number of samples with three or more same birthdays in vectors so that I can calculate the probabilities for each sample size. This is my third or fourth approach, but I am having difficulty getting the syntax to implement my ideas. I thought of indexing the room size so that it increased by 1 with each new simulation, but I could not figure out how to make that happen in terms of syntax. Is there a less cumbersome approach that I am missing? Thanks, Keith

16 years, 2 months

[gov2001-l] Harvard Coop: Important Information Regarding Your Spring 2008 Textbook Order (fwd)

by king＠harvard.edu

---------- Forwarded message ---------- Date: Thu, 21 Feb 2008 16:15:26 -0500 From: textbooks <textbooks at thecoop.com> To: Gary King <king at harvard.edu> Cc: Jens Hainmueller <jhainmueller at gmail.com>, Jenn Larson <jmlarson at fas.harvard.edu> Subject: Harvard Coop: Important Information Regarding Your Spring 2008 Textbook Order Dear Prof. King: We are writing to follow up on our message of 2/15/08. We want to let you know that copies of Unifying Political Methodology have arrived. We will contact any students who submitted reserve request reorders, but we would appreciate your making an announcement to your classes. If you have any questions or problems, please feel free to contact us at (617) 499-2223. Sincerely, David R. Boyd for Bob Wuesthoff, Textbook Manager Harvard Cooperative Society

16 years, 2 months

[gov2001-l] Installing Emacs/ESS on a Windows machine

by john.sheffield＠gmail.com

Silly technical question--I know Emacs for Windows exists, but I haven't found a way to install ESS so that I can use it to run R. If you've done this, know the link, or can give me suggestions, would you mind sending me a private email to help out? Thanks, John

16 years, 2 months

[gov2001-l] Uh, I guess I am the last kid to get picked again....

by orgeldi＠yahoo.de

Dear Nora. actually I want to write something about projects and project finance. Are you interested? ----- Urspr?ngliche Mail ---- Von: Nora Richardson <nrichard at fas.harvard.edu> An: gov2001-l at lists.fas.harvard.edu Gesendet: Mittwoch, den 20. Februar 2008, 08:54:23 Uhr Betreff: Re: [gov2001-l] Uh, I guess I am the last kid to get picked again..... Guten abendt Joerg. Du bist? Mein namen ist Nora und ich aus von Neuseeland. Ich suche eine Verfasser. Interessieren Sie sich fur Borsenbericht und Borsenzettel? Das Subjekt ich mochte Forschung. Interessie? ps. meine Deustch ist sehr schlecht. Wir sprechen sie Englisch, ja? Danke. bis bald. Nora -- "O King Alexander, each man possesses just so much of the earth as this on which we stand; and you being a man like other men, save that you are full of activity and relentless, are roaming over all this earth far from your home, troubled yourself, and troubling others. But not so long hence you will die, and will possess just so much of the earth as suffices for your burial." -- Translation Indian wise men Quoting Joerg Orgeldinger <orgeldi at yahoo.de>: > > Dear colleague. > > > > I am external from Germany and looking for a partner, I definetely want to > write a project in finance with Monte Carlo simulations. > > > > Regards > > Joerg > > > > > Heute schon einen Blick in die Zukunft von E-Mails wagen? Versuchen > Sie??s mit dem neuen Yahoo! Mail. www.yahoo.de/mail _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l Heute schon einen Blick in die Zukunft von E-Mails wagen? Versuchen Sie?s mit dem neuen Yahoo! Mail. www.yahoo.de/mail

16 years, 2 months

[gov2001-l] clarification on problem 2a

by keith.schnakenberg＠gmail.com

On question 2a, do we want to know the if the same birthday occurs three or more times, or if thee or more people share a birthday with at least one other person? In other words, does "(length(unique (room)) < people - 1) contain the information that we need to know? Thanks, Keith

16 years, 2 months

[gov2001-l] Matrix manipulation

by Jeremy.Hodgen＠kcl.ac.uk

Can anyone help? I'm trying to generate the inverse of a matrix but when I use ginv I get an error message: > matinv<-ginv(mat) Error: could not find function "ginv" Am I doing something stupid? Jeremy Dr Jeremy Hodgen Senior Lecturer in Mathematics Education King's College London Department of Education and Professional Studies Franklin-Wilkins Building Waterloo Bridge Wing 150 Stamford Street London SE1 9NH Tel: 020 7848 3102 Fax: 020 7848 3182 E-mail: jeremy.hodgen at kcl.ac.uk

16 years, 2 months

[gov2001-l] Problem with the matrix multiplication

by tganser＠fas.harvard.edu

Dear all, I am trying to write my OLS function and I am running into a problem. It'd be great if you could take a look at what I am doing and let me know where I am making a mistake. The problem I get is the following: when I try to matrix-multiply x_transpose with x, I get the error message: "*Error in x_trans %*% x : requires numeric matrix/vector arguments"* Now, examining my x, using str(), I get the following info: 'data.frame': 1000 obs. of 3 variables: $ x1: num 1.171 1.419 -0.219 -0.907 1.212 ... $ x2: num 4.68 3.08 2.14 2.22 2.62 ... $ x3: num 12.8 46.5 13.5 47.0 53.1 ... Examining my x_transpose, I get the following info: num [1:3, 1:1000] 1.17 4.68 12.84 1.42 3.08 ... - attr(*, "dimnames")=List of 2 ..$ : chr [1:3] "x1" "x2" "x3" ..$ : NULL By inspection, x_transpose contains all numbers. To be sure, I also transposed x, using the following for loop: x_trans <- matrix(NA, nrow = ncol(x), ncol = nrow(x)) for(i in 1:ncol(x)){ for(j in 1:nrow(x)){ x_trans[i,j] <- x[j,i] } } Examining the result of this with str(), I get the following info: num [1:3, 1:1000] 1.17 4.68 12.84 1.42 3.08 ... Again, I get the same error message when attempting matrix multiplication. It would be great if someone could let me know what I am doing wrong as I have been stuck on this problem for the past couple of hours and simply can't figure it out. Thanks a lot. -Tim

16 years, 2 months

[gov2001-l] Uh, I guess I am the last kid to get picked again....

by orgeldi＠yahoo.de

Dear colleague. I am external from Germany and looking for a partner, I definetely want to write a project in finance with Monte Carlo simulations. Regards Joerg Heute schon einen Blick in die Zukunft von E-Mails wagen? Versuchen Sie?s mit dem neuen Yahoo! Mail. www.yahoo.de/mail

16 years, 2 months

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Gov2001 February 2008