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16 results for “from:Pijus Virketis”

non-SQL sqlQuery error
Pijus Virketis · Feb 10, 2003 · r-help

Dear All, Reverting to RODBC 0.9.1 that I had archived resolved the problem. Thanks to Professor Ripley for noting that I had a non-release version of RODBC (how I might have obtained it is still beyond me...

anyone have RDCOMClient?
Pijus Virketis · Aug 23, 2006 · r-sig-finance

Hi, The Omegahat site looks to be down (one could add "again" after a glance at the r-help history); does anyone have their RDCOMClient package, on which RBloomberg depends? I looked for mirrors, but the one's I've...

non-SQL sqlQuery error
Pijus Virketis · Feb 10, 2003 · r-help

Professor Ripley, > There is no statement 3 in the released version of sqlGetResults ... In other words, I have an outdated/wrong version of RODBC? > You can. R are RODBC and Open Source, so why not open it and read it...

how to fit just a fixed effects model?
Pijus Virketis · Sep 16, 2002 · r-help

Dear all, How can one fit just a fixed effects model in R? lme() seems to require a random component, whereas I am just looking for something like STATA's "xtreg, fe" function. Thanks, Pijus ---- W: 212-588-7897 F...

print
Pijus Virketis · Sep 11, 2002 · r-help

>Suppose I have a vector >Fruits <- c('Apple','Orange','Pear','Banana','Mango') >I want to print the statement >"The fruits in the basket are: Apple, Orange, Pear, Banana, Mango" How about this: cat("The fruits in the basket are: ", paste...

improving ts object
Pijus Virketis · Dec 11, 2002 · r-help

Dear all, Currently, a ts object behaves like an array, and it would be very useful to have a similar object, which would behave like a data.frame, i.e. it could be indexed, named, etc. like a data.frame...

Interfacing R and C++ under Windows
Pijus Virketis · Jan 3, 2003 · r-help

Dear all, My colleague, who has been helping me with wrapping some older C++ code for use in R, has been running into some issues, which he asked me to post here: - ERROR is defined in RS.h which is...

portfolio optimization
Pijus Virketis · Apr 14, 2005 · r-sig-finance

Joe, Others have already pointed out the available QP tools. Let me add that you can always just write down utility as a function of portfolio weights and use optim() to solve the Markowitz problem (and more). Cheers, -P -----Original...

getting lapply() to work for a new class
Pijus Virketis · Aug 15, 2007 · r-help

Thank you. When I tried to set as.list() in baseenv(), I learned that its bindings are locked. Does this mean that the thing to do is just to write my own "lapply", which does the coercion using my "private...

getting lapply() to work for a new class
Pijus Virketis · Aug 15, 2007 · r-help

Hi, I would like to get lapply() to work in the natural way on a class I've defined. As far as I can tell, lapply() needs the class to be coercible to a list. Even after I define as...

handling dates in R
Pijus Virketis · Aug 28, 2002 · r-help

Dear all, I am just getting into R, and I arrive with a task in hand. I need to handle time series of price data, and use them in regressions and cluster models of various kinds. At this time, I...

non-SQL sqlQuery error
Pijus Virketis · Feb 10, 2003 · r-help

Dear all, I've encountered a curious problem. I am trying to run an SQL query using sqlQuery() function in RODBC. The query works fine when run in a stand-alone SQL browser (Microsoft Query Analyzer, in particular). However, when...

Scatter Plots using R?
Pijus Virketis · Apr 8, 2005 · r-sig-finance

Jay, Unless I am missing something that makes "scatter plot" graphs a particular term of art in finance, wouldn't the good old plot() function do all you require? As for "graphing R-squared", I am not quite sure what...

Backtest trading strategies
Pijus Virketis · Nov 28, 2005 · r-sig-finance

Much as I love R, I had occasion to contemplate its limitations vis-?-vis Python this weekend, when I had to scrape brutally malformed HTML and actually found it to be fairly painless thanks to BeautifulSoup (http://www.crummy.com...

R vs. S-PLUS vs. SAS
Pijus Virketis · Dec 2, 2004 · r-sig-finance

Hoon, Your questions were addressed to David, but I hope he won't mind if I interject. "How to handle a large dataset" is practically a FAQ on the R-help list: search through the archives at http://maths.newcastle...

VAR, VECM, Kalman, ... non-R software recommendations?
Pijus Virketis · Aug 20, 2004 · r-sig-finance

Dear Dirk, As far as my personal experience goes, I needed to estimate such models some time ago, when the R toolkit for this sort of thing was still almost empty, so I chose to invest in STATA: it provides...

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