Displaying 20 results from an estimated 2000 matches similar to: "Constrained OLS regression"
2006 Sep 19
3
Reading a file in R
Dear R helpers,
I am trying to read a CSV file in R called EUROPE (originally an Excel
file which I have saved as a CSV file) using the command
EUROPEDATA <- read.csv("EUROPE.csv")
EUROPE.csv is basically a matrix of dimension 440*44, and has a line of
headers, i.e. each column has a name.
Using read.csv I can't load the data into R properly. Although the first
20 columns or
2006 Oct 12
1
Variance Ratio test
Hello,
I am looking for a code in R for the variance ratio test statistic (the
Lo and Mackinlay version or any other versions).
Does anybody have such a code they can share or know a library in which
I can find this function?
Basically I have a number of time series which I need to check for
persistence. One other test I can use is the runs test in the tseries
package.
Any help will be greatly
2006 Jul 26
2
Codes; White's heteroscedasticity test and GARCH models
Hello,
I have just recently started using R and was wondering whether anybody had a code written for White's heteroscedasticity correction for standard errors.
Also, can anybody share a code for the GARCH(1,1) and GARCH-in-mean models for modelling regression residuals?
Thanks a lot in advance,
Spyros
---------------------------------
[[alternative HTML version
2006 Aug 28
1
Help on function adf.test
Hello everybody,
I've got a matrix called EUROPEDATA and I want to calculate the adf test statistic (part of the tseries package) on a rolling basis for window my.win on each column; i.e. each column of EUROPEDATA represents a particular variable; for the first column I calculate the adf test statistic for window my.win = 60 for example, roll forward one observation, calculate the adf
2007 May 14
6
Conditional Sums for Index creation
Hi,
Apologies for the long mail. I have a data.frame with columns of
price/mcap data for a portfolio of stocks, and the date. To get the
total value of the portfolio on a daily basis, I calculate rowSums of
the data.frame.
> set.seed(1)
> ab <- matrix(round(runif(100)*100),nrow=20,ncol=5)
> ab[1:5,4:5] <- NA
> ab[6:10,5] <- NA
> ac <- as.data.frame(ifelse(ab <=
2003 Oct 29
2
constrained OLS on coefficient
Hi,
I would like to know if anyone has any idea of how to run an OLS with
constraints? I need to contraint a coefficient estimate in the model equal to
1, and I am not sure how to include it into the OLS estimation...
I was hoping to find something like "cnsreg" in STATA..
thank you
Soyoko
______________________________________
Ms. Soyoko Umeno
Graduate Research Assitant for the
2003 Oct 29
0
constrained OLS
Hi,
I would like to know if anyone has any idea of how to run an OLS with
constraints?
thank you
Soyoko
______________________________________
Ms. Soyoko Umeno
Graduate Research Assitant for the Illinois-Missouri Biotechnology Alliance (IMBA) at http://www.imba.missouri.edu/
Ph.D. Student at the Department of Agricultural and Consumer Economics
at the University of Illinois at Urbana-Champaign
2012 Sep 24
11
76Gb to 146Gb
Hello all,
I have a DL360 G4 1U server that does a wonderfull job with dovecot horde,
Xmail and OpenLDAP for a company and serving about 40 acouunts.
The machine is wonderful. I am very happy with it.
However, I am running out of disk space.
It has two times 76Gb Drives in RAID1 (disk mirroring) and the capacity
has reached 82%.?
I am starting of getting nervous.
Does anyone know of a painless
2007 Oct 11
1
creating summary functions for data frame
I have a data frame that looks like this:
> gctablechromonly[1:5,]
refseq geometry gccontent X60_origin X60_terminus length kingdom
1 NC_009484 cir 0.6799 1790000 773000 3389227 Bacteria
2 NC_009484 cir 0.6799 1790000 773000 3389227 Bacteria
3 NC_009484 cir 0.6799 1790000 773000 3389227 Bacteria
4 NC_009484 cir 0.6799
2007 May 10
3
Quick question on merging two time-series of different frequencies
Hi,
A quick beginner's question. I have two time series, A with
daily data, and another B with data at varying frequencies, but mostly
annual. Both the series are sorted ascending.
I need to merge these two series together in the following way: For any
entry of A, the lookup should match with B until we find an entry of B
that's larger than A's.
For all A[i], i = 1,...,N and B[j],
2011 May 08
6
ntp revisited (so what to do ?)
OK,
So what you people say is :
1. Run "ntpdate" during startup only once
2. After that, keep time with ntpd
Right ?
Regards,
spyros
----
"I merely function as a channel that filters
music through the chaos of noise"
- Vangelis
2004 May 06
3
tcng ingress policing question
Hi all
I started playing with tcng to generate my tc rules, but I have some
difficulty implementing my rules...
The script below generates an error:
# Device eth0
tc qdisc add dev eth0 ingress
beginner.tc:2: don''t know how to build meter for this
The script is below, I changed the real IP numbers for XXs and YYs,
since it doesn''t really matter what they are. eth0 is the
2012 Oct 05
4
horde sync status ?
Hello all,
I had a quick look at the horde site and noticed that
horde is being advertised as, let's say, "smartphone friendly".
Does anyone know if the newest horde version can "talk" to?
smart phones in regards to e-mails ?
In other words, can a user owning a smartphone get his/her
e-mails on it apart from the webpage ?
Thank you,
spyros
?
----
"I merely
2007 Jun 05
2
Problems with Merge
Hi,
I have a history dataset, a matrix with about 1590 obs, and 242 cols,
and I need to update this matrix with an 'update' matrix that has about
30 rows, and roughly similar number of columns as the history ds (but
not necessarily equal). The update dataset is read from an Excel ODBC
connection. When I try and merge these datasets, I get counter-intuitive
results.
library(RODBC)
chn
2013 Jan 17
2
Explore patterns with GAM
Dear all,
I new to r and I would like your help.
I want to explore the patterns (unimodal, monotonically increased/decreased)
of species richness~altitude using GAM in R. Although I run the gam function
in mgcv package I do not know how to manually define knots and degrees of
freedom.
Any help would be greatly appreciated.
Spyros
--
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2012 Apr 01
3
Mail migration troubles
Hello all,
OK, I would really appreciate your help on this.
I managed to do a pretty straight-forward and flawless migration
on dovecot from one domain to another.
However, I have this nagging problem with most of the thunderbird
MTAs. When I try to delete some "test" messages I sent to make sure
that everything works, it comes back with the following message on
the bottom of the
2007 Aug 20
1
Ask for functions to obtain partial R-square (squared partial correlation coefficients)
The partial R-square (or coefficient of partial determination, or
squared partial correlation coefficients) measures the marginal
contribution of one explanatory variable when all others are already
included in multiple linear regression model.
The following link has very clear explanations on partial and
semi-partial correlation:
http://www.psy.jhu.edu/~ashelton/courses/stats315/week2.pdf
In
2010 May 24
7
Random dom0 lock up
Hi guys,
Having a weird issue with a Dom0. When we were running 2.6.18.8 kernel
the server would lock up every 2 weeks for no reason. Its been a
difficult one to resolve as there are no errors. We have now upgraded
to 2.6.32.13 and the lock ups are more often. For example today it
crashed in the morning, then it was rebooted and it crashed again about
5 hours later, no logs.
The
2011 May 09
2
dovecot user lost entire folder
Hello kind people,
OK, today is a bad day for me.
A user from a clients' site called early in the morning to inform
me that she lost an entire folder on thunderbird with (naturally)
important stuff in it.
I am trying to find the lost folder, but there is nowhere to be
found.
Any ideas would greatly appreciated.
Regards,
Spyros
"dovecot -n" :
2012 Aug 09
3
dovecot rpm packages for CentOS ?
Hello all again,
Has anyone any idea how to get the latest dovecot version for CentOS
5.8 or 6.2 32-bit OS ?
I did a quick search and found out that the official version of dovecot
for CentOS v5.8 is 1.0.2 (!!).
Any repos ? Any ideas :-) ?
Thank you all,
spyros
?
----
"I merely function as a channel that filters
music through the chaos of noise"
- Vangelis