similar to: special question on regression

Displaying 20 results from an estimated 12000 matches similar to: "special question on regression"

2013 Feb 19
2
Implementing tf-idf weighting scheme in Xapian
Hello guys.I just read up about tf-idf schemes and want to implement it in Xapian (with some frequently used normalizations) as it will also give me a good hang of implementing a weighting scheme before I start working on implementing DFR schemes. I read the following as references and I think Ive understood it well and can write the hack :- 1.)
2006 Jun 18
1
Bayesian Networks with deal
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2011 Aug 15
2
plotting segments only and in color
Hello, I've a question concerning the display of interval data. A sample dataset where X is an interval between Xa and Xb which should be displayed: Y=c(15,14,23,18,19,9,19,13) Xa=c(17,22,21,18,19,25,8,19) Xb=c(22,22,29,34,19,26,17,22) X = (Xa+Xb)/2 It's easily possible to plot the mean of the interval like: plot(X,Y) afterwards I can create lines for the interval with:
2014 Jan 11
3
[LLVMdev] Quirk in switch lowering
Hello Anton! > Some of the behavior seen there was for a purpose, > like the heuristics to overcome different problems. > I have to remember all the details :) I have read your article "Improving Switch Lowering for The LLVM Compiler System" and thought that the selection mechanism works out well; by chance however I found that this mechanism does not work as designed if
2009 Nov 04
1
variable selectin---reduce the numbers of initial variable
hello, my problem is like this: now after processing the varibles, the remaining 160 varibles(independent) and a dependent y. when I used PLS method, with 10 components, the good r2 can be obtained. but I donot know how can I express my equation with the less varibles and the y. It is better to use less indepent varibles. that is how can I select my indepent varibles. Maybe GA is good
2011 Dec 06
5
Argument validation within functions
Hi, I just started with writing functions in R and so some questions popped up. I provide some values as argument to my function such as: function(a,b,c){} Now i want that the function first checks if the arguments are valid for the function. E.g argument "a" has to be a number in the range 0-1. How can that easily done? So far I have: a <- as.numeric(a) if(0 <= a &&
2012 Feb 03
2
Assigning objects to variable and variable to list in a for loop
Hello, I want to use a for loop for repeadely calculating a maxent model (package dismo, function maxent()) which creates an object of the class maxent (S4). I want to collect all the resulting object in a list. I tried to simplify my for loop to explain what I want. There are two problems/questions: 1) How can I create the new variables in the loop (using paste) and assign the objects 2) How
2014 Jan 10
2
[LLVMdev] Quirk in switch lowering
Hello Rafael, hello all! > Would you mind reporting a bug in llvm.org/bugs? I have already done so, see the following entries: http://llvm.org/bugs/show_bug.cgi?id=18347 http://llvm.org/bugs/show_bug.cgi?id=18348 http://llvm.org/bugs/show_bug.cgi?id=18349 Best regards Jasper Neumann
2012 Jun 08
4
Sort 1-column dataframe with rownames
Hi, I have a 1-column dataframe with rownames and I want to sort it based on the single column. The typical procedure that is recommended in diverse posts is to use order in the index. But that "destroys" my dataframe structure. Probabaly it is a very simple solution. Here is a short reproducable example: x <- c(1,3,51,2,34,44,12,33,2,8) df <- data.frame(x) rownames(df) <-
2012 Jan 25
4
x11() graphic device, displaying raster
Hello, I am wondering about the X11() graphic device on Windows. I try to plot a raster image but nothing gets displayed. I found some pages where it is mentioned that x11() not always supports raster rendering. Is there any add on for x11, any update or any R-package which solves that displaying problem in Windows? What I try to test it is an example from the package {raster}: library(raster)
2012 Jan 25
4
x11() graphic device, displaying raster
Hello, I am wondering about the X11() graphic device on Windows. I try to plot a raster image but nothing gets displayed. I found some pages where it is mentioned that x11() not always supports raster rendering. Is there any add on for x11, any update or any R-package which solves that displaying problem in Windows? What I try to test it is an example from the package {raster}: library(raster)
2013 Mar 13
5
string split at xth position
Hi, I have a vector of strings like: c("a1b1","a2b2","a1b2") which I want to spilt into two parts like: c("a1","a2","a2") and c("b1","b2,"b2"). So there is always a first part with a+number and a second part with b+number. Unfortunately there is no separator I could use to directly split the vectors.. Any idea
2011 Aug 15
2
Extracting information from lm results (multiple model runs)
Just to inform: I posted that before in R-sig-ecology but as it might be interesting also for other useRs, I post it also to the general r-user list: Hello Alexandre, thank you very much. I also found another way to extract summarizing information from lm results over e.g. 1000 repeated model runs: results2 <- t(as.data.frame(results)) summary(results2) Although some questions popped up in
2012 Sep 27
4
Colsplit, removing parts of a string
Hi, I am using colsplit (package = reshape) to split all strings in a column according to the same patterns. Here an example: library(reshape2) df1 <- data.frame(x=c("str1_name2", "str3_name5")) df2 <- data.frame(df1, colsplit(df1$x, pattern = "_", names=c("str","name"))) This is nearly what I want but I want to remove the words
2002 Feb 04
5
slowdown and reiserfs
hi i got 2 questions and maybe someone could shed some light: a) i'm using kernel 2.4.17 and use ext3 in it. is it possible that the whole system is slower than with ext2? i switched back to ext2 (great feature!!!) and the system's response seemed somewhat better. should/could there be such a effect as double writing of journaled data? i didnt activate debugging (jbd). b) is reiserfs
2012 May 31
3
Remove columns from dataframe based on their statistics
Hi, I have a dataframe and want to remove columns from it that are populated with a similar value (for the total column) (the variation of that column is 0). Is there an easier way than to calculate the statistics and then remove them by hand? A <- runif(100) B <- rep(1,100) C <- rep(2.42,100) D <- runif(100) df <- data.frame(A,B,C,D) # if want to conditionally remove column B and
2012 May 04
1
Absolute cumulative curve with ecdf/stepfun?
Hi, I have two variables ranging both from 0 to 1 (n=500 each). Now I am interested in plotting them both in one plot (using ggplot2). So far I used ecdf() (from an example I found with google) to get values for the cumulatice distribution function which gives a relative curve. I also want to do the same plot but using absolute cumulative values instead of relative. Can that be done with ecdf or
2012 Oct 01
6
nlme: spatial autocorrelation on a sphere
I have spatial data on a sphere (the Earth) for which I would like to run an gls model assuming that the errors are autcorrelated, i.e. including a corSpatial correlation in the model specification. In this case the distance metric should be calculated on the sphere, therefore metric = "euclidean" in (for example) corSpher would be incorrect. I would be grateful for help on how to
2009 Sep 21
2
logarithmic seq() ?
Hello, in scilab /Matlab there are functions that can create linear sequences (like R's seq()) as well as logarithmic sequences. Is there a logarithmic aequivalent of seq()? Or maybe this would be an idea for newer R-releases, maybe a type-option with "linear" and "logarithmic" as parameters....?! Ciao, Oliver
2012 Feb 14
3
Wildcard for indexing?
Hi, I'd like to know if it is possible to use wildcards * for indexing... E.g. I have a vector of strings. Now I'd like to select all elements which start with A_*? I'd also need to combine that with logical operators: "Select all elements of a vector that start with A (A*) OR that start with B (B*)" Probably that is quite easy. I looked into grep() which I think might