Displaying 9 results from an estimated 9 matches for "hainmueller".
2005 Oct 13
3
Optim with two constraints
Hi R-list,
I am new to optimization in R and would appreciate help on the following
question. I would like to minimize the following function using two
constraints:
######
fn <- function(par,H,F){
fval <- 0.5 * t(par) %*% H %*% par + F%*% par
fval
}
# matrix H is (n by k)
# matrix F is (n by 1)
# par is a (n by 1) set of weights
# I need two constraints:
# 1.
2004 Mar 08
1
drawing filled countries according to data using map('world')? - follow up
...te.to.map, year == 1980] : incorrect number of dimensions
> color <- dv[state.to.map, year == 1980]/100
Error in dv[state.to.map, year == 1980] : incorrect number of dimensions
What am I doing wrong? (there are a few values missing in "fix.float")
Thanks for your help!
Best
Jens Hainmueller
2005 Apr 21
2
local average
Hello,
probably this isn't hard, but I can't get R to do this. Thanks for your
help!
Assume I have a matrix of two covariates:
n <- 1000
Y <- runif(n)
X <- runif(n,min=0,max=100)
data <- cbind(Y,X)
Now, I would like to compute the local average of Y for each X interval 0-1,
1-2, 2-3, ... 99-100. In other words, I would like to obtain 100 (local)
Ybars, one for each
2006 Aug 04
2
why does lm() not allow for negative weights?
Dear List,
Why do commonly used estimator functions (such as lm(), glm(), etc.) not
allow negative case weights? I suspect that there is a good reason for this.
Yet, I can see reasonable cases when one wants to use negative case weights.
Take lm() for example:
###
n <- 20
Y <- rnorm(n)
X <- cbind(rep(1,n),runif(n),rnorm(n))
Weights <- rnorm(n)
# Includes Pos and Neg Weights
Weights
2004 Mar 09
0
Re: R-help Digest, Vol 13, Issue 8
...3. Re: graphic device MetaPost (Gabor Grothendieck)
> 4. Re: graphic device MetaPost (Itay Furman)
> 5. applying data generating function (Fred J.)
> 6. missing values (Grace Conlon)
> 7. drawing filled countries according to data using
> map('world')? (Jens Hainmueller)
> 8. Re: missing values (Peter Dalgaard)
> 9. RE: applying data generating function (Phineas Campbell)
> 10. Re: applying data generating function (Christophe Pallier)
> 11. Re: applying data generating function (Spencer Graves)
> 12. Frequency ploygon help (Robert W. Ba...
2004 Mar 09
1
vector extraction
Hello,
I could need some help on this one:
>From the data.frame "Test.dataset2" below (TSCS data for 151
"countries.to.map" for "year" 1973-95; each "country.to.map" is described by
a unique code), I would like to extract a vector "color" that for each
"country.to.map" takes on the value of "dv" (a categorical variable with
2004 Sep 15
1
control of font size & colour for title, subtitles, axis, and tick marks in LATTICE graph
Hi,
I very much appreciate any help on this "fine tuning" problem in a lattice
graph (I am new to LATTICE and could not find an example in the help files
that worked for me. My apologies if I missed it there).
I am running the following box plots to compare conditional distributions of
x at different levels of y under two treatment conditions ID=1 (upper
panel ) & ID=0 (lower panel
2004 Dec 16
1
help with multiple imputation using imp.mix
I am desperately trying to impute missing data using 'imp.mix' but always
run into this yucky error message to which I cannot find the solution. It's
the first time I am using mix and I'm trying really hard to understand, but
there's just this one step I don't get...perhaps someone knows the answer?
Thanks!
Jens
My code runs:
2005 Nov 29
0
sensitivity tests fo causal inference
Hi all,
Following up on Holger's email last week:
Does anyone know if there exists a library that implements the sensitivity
tests for hidden bias for matched pairs and unmatched groups as proposed in
Rosenbaum's Observational Studies (2002: ch.4)?
Thanks.
Best,
jens