search for: chow

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, data = database1, type = "Chow",  point = 20, asymptotic = FALSE)   Unfortunately,...

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 last stage) many of my constraints get dropped, this...

...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 could do it? Thanks for any suggestions. Charles Cameron Professor of Politics & Public Affairs Princeton University [[alternative HTML version deleted]]

...at least as a short-term solution. However, I fully admit that this is because I am familiar with the shrink wrapping code and completely naive about SplitCSR and what work would be necessary to get this working well. My proposal would be to implement the flow sensitive analysis described by Fred Chow (PLDI '88) and make the necessary extensions in shrink wrapping to handle multiple save/restore points. At that point we can do an evaluation to understand the improvements it provides and the impact on compile time. Once we have these results, we can look at the best way to enable it (e.g., op...

...art, 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 test appears to work for linear regression only (see: http://en.wikipedia.org/wiki/Chow_test). Another option I was thinking of is to estimate an alternative model in which the coefficients for x1 and x2 are constraint to be equal and to compare the fit of such a constrai...

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 grateful...

...le, 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 variance ratio of Lo and Mackinlay (1988) and Chow and Denning (1993)     Waiting eagerly for your reply. Amira Akl Ahmed [[alternative HTML version deleted]]

...ssage 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: http://r.789695.n4.nabble.com/Error-message-in-as-brob-Usage-tp2967885p2967885.html Sent from the R help mailing list archive at Nabble.com.

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 in our local repository. > > Still, what's the status of this thing? > The status is currently...

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 results as data flow analysis based approach. Also I do not understand one of your comment on review : > > 1...

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

...s loaded. ** Loading any Rails specific GemPlugins ** Signals ready. TERM => stop. USR2 => restart. INT => stop (no restart). ** Rails signals registered. HUP => reload (without restart). It might not work well. ** Mongrel available at 0.0.0.0:8225 ** Writing PID file to /opt/rails/chow/production/current/log/mongrel.8225.pid deadlock 0x2a988d7008: sleep:F(3) - /opt/ruby/default/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:723 deadlock 0x2a9a18d700: sleep:- - /opt/ruby/default/lib/ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:76 deadlock 0x2a9a349ad0: sleep:- - /...

...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

...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 documentation anywhere. Does > it work? Hi! I work on implementing of optimistic graph coloring algorithm (by Preston Briggs) for LLVM. I didn't mentioned it on this list directly though. Currently, my implementation is in the testing stat...

...d 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 -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20040121/3c46957a/attachment.htm

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...

...e 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