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Hi,   A question on something which normally should be easy !   I perform a linear regression using lm function:   > reg1 <- lm (a b+c+d, data = database1)   Then I try to perform the Chow (1960) test (structural change test) on my regression. I know the breakpoint date. I try the following code like it is described in the “Examples” section of the “strucchange” package :   > sctest(reg1,

Hello R-users! I tried to find a package to run a CHOW TEST. As a reference package I found the STRUCCHANGE package. Do you know if it works well otherwise can you recommend a different one? Thanks, Bernd -- View this message in context: http://www.nabble.com/Chow-Test-tf3878416.html#a10990270 Sent from the R help mailing list archive at Nabble.com.

Good day R-listers, My question is more a statistical question than an R related question, so please bear with me i'm currently applying the chow test of poolability in fact i'm working with panel N=17 T=5 , and my model looks like this : Yit= a0+B1X1+B2X2+B3X3+B4X4+eit My question is the following when i'm Testing for the equality of the coefficients of the unpooled data (the

Suppose one estimates a classification or regression tree (CART) for one group or one time period; and then estimates a CART for another group or time period. Is there a way to test for a structural change or break across the two groups or between the two time periods, in other words, is there an analogue of a Chow Test for CART? Has anyone ever seen anything like this or have any ideas how one

Hi all, We've seen several examples recently of performance opportunities on POWER if we can improve the location of save/restore code for callee-saved registers. Both Nemanja and myself have discussed this with several people, and it seems that there are two possibilities for improving this: 1. Extend shrink wrapping to make the analysis of callee-saved registers more precise. 2.

Dear all, I'm running a coxph model of the form: coxph(Surv(Start, End, Death.ID) ~ x1 + x2 + a1 + a2 + a3) Within this model, I would like to compare the influence of x1 and x2 on the hazard rate. Specifically I am interested in testing whether the estimated coefficient for x1 is equal (or not) to the estimated coefficient for x2. I was thinking of using a Chow-test for this but the Chow

I'm just starting to dive into llvm, hoping to implement a good graph coloring register allocator. I gather that this has been discussed before. What is the RegAllocGraphColoring.cpp currently in the sources? It seems to be the Fred Chow algorithm but it's not mentioned in the documentation anywhere. Does it work? -Dave

Dear R-helpers, I have been trying to carry out some variance ratio tests such as Lo-MacKinlay test and Chow-Denning test. However, When I write the function LM <- Lo.Mac(y,kvec) or any other functions I don’t get the results displayed. The only sign I get is < I don’t understand what’s wrong (is it the package, misspecification of the function, Vista). I am really stuck in and I would be

Hello I am a new user of R software. I benefit from using vrtest-package. However, the codes provided by the aforementioned package, for example, calculate the test statistics for Lo and Mackinlay (1988) under the assumptions of homoscedasticity and heteroscedasticity without computing the value of the variance ratio itself.   I would be grateful if you could instruct me how to calculate the

I am getting the following error message while using the as.brob function in some computations: Error in out.x[ss] <- pmax(x1[ss], x2[ss]) + log1p(+exp(-abs(x1[ss] - : NAs are not allowed in subscripted assignments Is there any obvious mistake I am making here that can resolve the above error message? Thanks for your help. Chow -- View this message in context:

On 4/3/07, David Greene <greened at obbligato.org> wrote: > David Greene wrote: > > > What is the RegAllocGraphColoring.cpp currently in the > > sources? It seems to be the Fred Chow algorithm but > > it's not mentioned in the documentation anywhere. Does > > it work? > > Ah, ok. One of our folks here grabbed it off the mailing > list and put it

Hello Quentin, I see your work on shrink-wrapping optimization at http://reviews.llvm.org/rL236507 IPRA has benefited shrink-wrapping optimization ( I have noticed that on sqlite3 test-case) so I did read Fred Chow's paper and compare that approach with yours I did not understand much of your work :-( in comparison to original paper but I feel that current approach is not generating same

Hi, The following is done on a samba share:- When I want to hide files in on the Windows interface, I right-click the file and check on the hidden attribute, but the file still appears there. Must I rename the file with a dot in front in order to hide it? Any alternative to allow the use of Windows interface to hide it? Thanks. adrian

Hi, My samba is 3.0.13 version. I got a funny problem. UserA logs on to a shared (all users can read/write/execute rights) drive and opens an excel file. UserA closes the file or modifies it. When UserA reopens the file in 5 secs or less, the file seems to be lock by the computer that UserA is on! When UserA had closed the file, UserB on another computer tries to open the file and it says

Hi all, I''m getting a strange, intermittent Thread deadlock in production: deadlock 0x2a988d7008: sleep:F(3) - /opt/ruby/default/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:723 CPU usage spikes to a full core and Apache 502''s on requests that got handed to that particular listener each time. I tried attaching with gdb, and gdb twisted itself into a knot. Anyone have

...in. I get an "access denied" error. There are no entries in any of the samba logs when I attempt to open the DNS Manager snapin either. I CAN access the DNS on the original DC using the DNS Manager RSAT snapin. I'm hoping (and suspecting) this will just be an easy fix of chmodding/chowing something... I've spent the last hour googling and have come up with nada. Any help you can provide would be VERY appreciated! -- *Taylor Hammerling* | *IT Manager* 2800 Laura Lane | Middleton, WI 53562 *O *(608) 669-9070 *| C *(608) 512-7849 tcsbasys.com | ubiquistat.com

On 4/3/07, David Greene <greened at obbligato.org> wrote: > > I'm just starting to dive into llvm, hoping to implement a > good graph coloring register allocator. I gather that this > has been discussed before. > > What is the RegAllocGraphColoring.cpp currently in the > sources? It seems to be the Fred Chow algorithm but > it's not mentioned in the

Hi there, Regarding the calling card system, I would like to know what software tools are suitable to write the CDR system? 1) Perl (but what kind of database should be used?) 2) PHP + MySQL 3) or others suggestion? Also, which one is easier to access AGI? Any source and information would be appreciated. Best regards, Max Chow -------------- next part --------------

Full_Name: Ruskin Chow Version: R 2.0.1 OS: Windows 2000 Submission from: (NULL) (203.169.154.66) Data imported from SAS using read.xport() in package foreign are converted to <NA> when the SAS data field consists of character strings that are only one character long. This is apparently a previously reported bug and perhaps fixed in some platform other than Windows (rw2001).Some

Hello R Pioneers, I sometimes use R on a dual CPU PC runing Linux and find that only 1 CPU is used even when no other user/process competes for resources. Can we make R uses both CPUs to have the job done sooner? I know this is probably asking too much for something that is free. Has anyone else thought about it? Thanks. Ming Chow