Hey Justin/Holger, I had a question on the HW for part (c). Are you asking for "the probability that three people were born in the same month" or "the probability that AT LEAST three people were born in the same month"? Thanks -Patrick _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

Hi Justin and Holger, I have a question on how to interpret the probability (a). Does "separate individuals randomly selected with equal probability" mean the same individual can be selected more than once as one of 5 samples? or 5 samples you take out of 25 have to be different people? Thanks, Tomoko _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

Hey all, I'm trying to do the last question on the homework, but for some reason I can't access the columns of the data frame in the normal way: NULL Is there something I'm doing wrong? Alex _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

Isn?t ?countif? just a kind of condensed if/then statement? I think you could write a countif() function very easily. From: gov2001-l-bounces at lists.fas.harvard.edu [mailto:gov2001-l-bounces at lists.fas.harvard.edu] On Behalf Of suerie_moon at ksgphd.harvard.edu Sent: 21 February 2007 20:59 To: gov2001-l at lists.fas.harvard.edu Subject: [gov2001-l] R equivalent of Excel "countif" function? Hi all, does anyone know if R has an equivalent to the "countif" function? I searched the help directory but it doesn't seem too clear. If R does not have a direct equivalent, is there an "if" type function one could use, and does anyone have any bright ideas on how to do so? Thanks in advance for any help, -Suerie -----gov2001-l-bounces at lists.fas.harvard.edu wrote: ----- To: gov2001-l at lists.fas.harvard.edu From: hlk23 at cornell.edu Sent by: gov2001-l-bounces at lists.fas.harvard.edu Date: 02/21/2007 11:43AM Subject: Re: [gov2001-l] Dataset in HW2 Alex, type in data <- as.data.frame(data) to turn the matrix into a dataframe first. Or use data[,1] to subset the cols of the matrix. Holger Alex Nicholas D'Amour wrote: "http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l"http://lists.fas.ha rvard.edu/mailman/listinfo/gov2001-l -- Holger Lutz Kern Graduate Student Department of Government Cornell University Institute for Quantitative Social Science Harvard University 1737 Cambridge Street N350 Cambridge, MA 02138 www.people.cornell.edu/pages/hlk23 _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu HYPERLINK "http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l"http://lists.fas.ha rvard.edu/mailman/listinfo/gov2001-l -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.3/694 - Release Date: 20/02/2007 13:44 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.441 / Virus Database: 268.18.3/694 - Release Date: 20/02/2007 13:44

What it sounds like you want to do (although I don't know Excel very well so I don't know for sure) is count up the number of "observations" in a variable or vector or whatever that satisfy some argument. So, let's say you had a vector called vector and you wanted to know how many of its values were equal to 3. You would code: length(vector[vector==3]) If you wanted to know how many were strictly greater than 5, you'd code: length(vector[vector>5]) Hope this helps. Matt suerie_moon at ksgphd.harvard.edu wrote: _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

Hi guys, I don't know why I am having problems importing my plots into latex, but this is what I did... (1)In R, I saved one of my plots as "ABC" on my desktop as a .ps file (2)In latex, I inserted this: \begin{figure}[h!] \begin{center} \includegraphics[width=3.5in, height=3.5in]{ABC.ps} \end{center} \end{figure} I end up with error messages (stating that ABC is not found) when I try to texify; I also tried including the \userpackage {graphix} option within and outside of the figure and still get an error message... I also tried Gavril's method and it still didn't work. Any ideas? Thanks a million in advance! ~Hai _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

Hi guys, I don't know why I am having problems importing my plots into latex, but this is what I did... (1)In R, I saved one of my plots as "ABC" on my desktop as a .ps file (2)In latex, I inserted this: \begin{figure}[h!] \begin{center} \includegraphics[width=3.5in, height=3.5in]{ABC.ps} \end{center} \end{figure} I end up with error messages (stating that ABC is not found) when I try to texify; I also tried including the \userpackage {graphix} option within and outside of the figure and still get an error message... I also tried Gavril's method and it still didn't work. Any ideas? Thanks a million in advance! ~Hai _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

Hmmm...still doesn't work... I saved both my ABC.ps and the tex file on my desktop, and it didn't work. So I then made a new folder and placed both the ABC.ps and the tex doc in there...nothing... -----Original Message----- From: gov2001-l-bounces at lists.fas.harvard.edu [mailto:gov2001-l-bounces at lists.fas.harvard.edu] On Behalf Of Katy Backes Kozhimannil Sent: Wednesday, February 21, 2007 10:38 PM To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] Importing plots into latex Hello Hai, The TeX document will look in the directory where it is saved to find the ABC.ps file that you are trying to insert, so if you save both the plot and the .tex file in the same folder, the TeX document should be able to find it. I had similar problems with the last problem set - hope this helps! Katy On 2/21/2007 10:33 PM, Hai Tiet wrote: > Hi guys, > > I don't know why I am having problems importing my plots into latex, but > this is what I did... > (1)In R, I saved one of my plots as "ABC" on my desktop as a .ps file > (2)In latex, I inserted this: > \begin{figure}[h!] > \begin{center} > \includegraphics[width=3.5in, height=3.5in]{ABC.ps} > \end{center} > \end{figure} > > I end up with error messages (stating that ABC is not found) when I try

> texify; I also tried including the \userpackage {graphix} option within

_______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

Holger, When I try to texify (inside the black box) it says: ! LaTex Error: File 'betty1' not found. If I add a .ps after betty1 within my \includegraphics command I get: ! LaTex Error: Unknown graphics extension: .ps. -----Original Message----- From: gov2001-l-bounces at lists.fas.harvard.edu [mailto:gov2001-l-bounces at lists.fas.harvard.edu] On Behalf Of Holger Lutz Kern Sent: Wednesday, February 21, 2007 10:52 PM To: gov2001-l at lists.fas.harvard.edu Subject: Re: [gov2001-l] Importing plots into latex Hai, what exactly happens? What error message do you get? Holger Hai Tiet wrote: > Hmmm...still doesn't work... > > I saved both my ABC.ps and the tex file on my desktop, and it didn't

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