Gov2001 April 2003

gov2001@lists.gking.harvard.edu

22 participants
48 discussions

[gov2001-l] question c

by kimai＠fas.harvard.edu

You don't have to redo this, but for question c you may want to construct bins based on the quantiles of the predicted probabilities. This way, you won't have some empty bins (then, you don't need to indicate how many observations are). Kosuke

21 years, 1 month

[gov2001-l] FW: [gov1000-list] sorting dataframes/matrices

by smarkus＠fas.harvard.edu

it pays to check out old emails sometimes ;) -----Original Message----- From: gov1000-list-admin(a)fas.harvard.edu [mailto:gov1000-list-admin@fas.harvard.edu] On Behalf Of Dave Kane Sent: Sunday, December 08, 2002 1:08 PM To: Phillip Y. Lipscy Cc: gov1000-list(a)fas.harvard.edu Subject: [gov1000-list] sorting dataframes/matrices help(sort) points you to "order". Check out the help. Here is an example: > x a b 1 1 o 2 2 c 3 3 x 4 4 h 5 5 f > x[order(x$b),] a b 2 2 c 5 5 f 4 4 h 1 1 o 3 3 x > x[order(x$a),] a b 1 1 o 2 2 c 3 3 x 4 4 h 5 5 f > Dave Phillip Y. Lipscy writes: > Dear all, > > sort() works nicely for vectors but not for dataframes and matrices (for > matrices it doesn't sort by columns properly). Since even ms excel can sort > dataframes by columns, I'm assuming R can do that too, but so far I haven't > found anything that seems to let me do that. Any ideas? > > Thanks, > Phillip. > > ------------------------------------------------- > Phillip Y. Lipscy > Perkins Hall Room #129 > 35 Oxford Street > Cambridge, MA 02138 > (617)493-4893 > lipscy(a)fas.harvard.edu > > Ph.D. Candidate > Harvard University, FAS, Department of Government > ------------------------------------------------- > > > > > > _______________________________________________ > gov1000-list mailing list > gov1000-list(a)fas.harvard.edu > http://www.fas.harvard.edu/mailman/listinfo/gov1000-list -- David Kane Lecturer in Government 617-563-0122 dkane(a)latte.harvard.edu _______________________________________________ gov1000-list mailing list gov1000-list(a)fas.harvard.edu http://www.fas.harvard.edu/mailman/listinfo/gov1000-list

21 years, 1 month

[gov2001-l] Question C: Sorting a column within a matrix

by dhopkins＠fas.harvard.edu

Dear All, Quick question: if I have a 544x2 matrix, and wish to sort that matrix so that the first column is in ascending order, and so that the correspondence between the first column value and the second column value for each row is preserved, how do I do that in R? Commands including "sort", "order," and "rank" seem unhelpful, though perhaps I am using them incorrectly? Many thanks. Best, Dan

21 years, 1 month

[gov2001-l] Question b

by lee57＠fas.harvard.edu

What's the code for drawing lines for question b? is it in the form of lines(something something something)? Thanks,

21 years, 1 month

[gov2001-l] Assignment 6

by lee57＠fas.harvard.edu

Two questions 1. What goes on the x-axis for the graphs in part a? I'm thinking ADAACA, and there will be two curves- one for high and the other for low growth. And I'll repeat the same graph, this time for non-incumbent. Am I right? 2. How do I graph CI for part b? Thanks, Chester

21 years, 1 month

[gov2001-l] Re: Assignment 6

by kimai＠fas.harvard.edu

> 1. In part b: Is it OK if I calculate the mean probability and the 95% > confidence interval and provide a density plot? You want figures that look like the one in the lecture notes (Replication of Garrett) > 2. Regarding part c: We have to simulate predicted values. I am not sure > whether the simaultion in the solution of question 2 in HW5 was of predicted > values or rather expected values. So which is it? You need the predicted probabilities. Kosuke

21 years, 1 month

[gov2001-l] Re: question b

by kimai＠fas.harvard.edu

> What exactly are we supposed to do for question b? > My understanding is that I need to come up with a graph that is > similar to what Gary had in the slides (the graph that 250 people asked > for). Am I right? How is "First differences" then? How do I draw lines > that represent the confidence intervals? HELP!!!!! Yes, that's what you are supporsed to do. You are also right that it's not really "first differences." Kosuke

21 years, 1 month

[gov2001-l] Grabbing Array indices

by brightjo＠gse.harvard.edu

Hi, This is an R question I've had from the beginning of the semester. I would like to be able to grab the indices of an array conditioned on some criteria. For example, if I have > foo <- c(1,2,1,2) > foo [1] 1 2 1 2 and I want the indices of foo where foo[i]=1; is there a simple command in R to do that? I know I can write a function that will do it: > index <- seq(1:length(foo)) > bar <- index[index*((foo==1)*1) != 0] so that > bar [1] 1 3 and > foo[bar] [1] 1 1 But, am I overlooking an obvious solution built into R? Thanks, John.

21 years, 1 month

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Gov2001 April 2003