Displaying 20 results from an estimated 3000 matches similar to: "adding one line to a plot"
2009 Apr 23
4
rbind data frames stored in a list
Hello everyone!
I have a list X with 3 elements, each of which is a data frame, for example:
a<-data.frame(a=1,b=2,c=3)
b<-data.frame(a=c(4,7),b=c(5,8),c=c(6,9))
c<-data.frame(a=c(10,13,16),b=c(11,14,17),c=c(12,15,18))
X<-list()
X[[1]]<-a
X[[2]]<-b
X[[3]]<-c
(X)
How can I most effectively transform X into a data frame with columns
a, b, and c?
I would love to find a generic
2010 May 05
1
T-test & for loop
I have been set a question which i understand statistically but my inability
with R is preventing me from finishing it..
My question is that we to calculate the frequency of Type 1 errors
starting with x = rnorm(10, 0.1, 1)
then doing a t-test seeing whether you reject the null hypothesis (Ho mu =
0) alternative is mu > 0
Then i am supposed to use a for loop to do this procedure 10 000
2006 Jul 16
2
Matrices given to pt? [was: [R] for loops and counters]
Hi, people.
I was a bit intrigued by the message quoted below. Indeed, if pt() is
given a matrix, it returns a matrix. Should this feature be documented?
?pt speaks about "a vector of quantiles", and says nothing about the
type of what it returns.
The same might presumably apply to other distribution-related functions.
----- Forwarded message from Martyn Plummer <plummer at
2005 Apr 05
2
Stats Question: Single data item versus Sample from Norma l Distribution
Here's one possibility, assuming muhat and sigmahat are estimtes of mu and
sigma from N iid draws of N(mu, sigma^2):
tStat <- abs(x - muhat) / sigmahat
pValue <- pt(tStat, df=N, lower=TRUE)
I'm not quite sure what df tStat should have (exercise for math stat), but
given fairly large N, that should make little difference.
Andy
> From: Ross Clement
>
> Hi. I have a
1999 Oct 05
2
for loops and counters
I am trying to assign values to a vector (pvalue). Similar code works in C
but not in R. What am I doing wrong?
r <- pvalue <- 0
for(i in (1:(k-1))){
for(j in (i+1):k){
r <- r+1
tstat <- (means[i]-means[j])/rms
pvalue[r] <- 2*(1-pt(abs(tstat),df))
}
}
Thank you.
Peter B.
--
Peter B. Mandeville mandevip at deimos.tc.uaslp.mx
Jefe del
2010 Jan 18
1
density() vs. KernSmooth::bkde
Any advice when to use denstity() and when the KernSmooth package bkde()
to smooth a histogram?
No specific problem to use either one, but I'm curious why there are two
so similar implementations.
Thanks!
mario
--
Ing. Mario Valle
Data Analysis and Visualization Group |
http://www.cscs.ch/~mvalle
Swiss National Supercomputing Centre (CSCS) | Tel: +41 (91) 610.82.60
v.
2017 Jul 27
2
na.rm = T treatment by ggplot2's geom_bar
I think you should be more suspicious of yourself, Dimitri. A letter T variable can easily arise in the problem domain when you are not thinking of logical values at all, at which point your cavalier use of T as a synonym for TRUE can suddenly become a bug.
--
Sent from my phone. Please excuse my brevity.
On July 27, 2017 8:18:03 AM PDT, Dimitri Liakhovitski <dimitri.liakhovitski at
2008 Sep 08
7
Question about multiple regression
Dear R-list,
maybe some of you could point me in the right direction:
Are you aware of any FREE Fortran or Java libraries/actual pieces of
code that are VERY efficient (time-wise) in running the regular linear
least-squares multiple regression?
More specifically, I have to run small regression models (between 1
and 15 predictors) on samples of up to N=700 but thousands and
thousands of them.
I
2013 Jun 08
1
splitting a string column into multiple columns faster
Hello!
I have a column in my data frame that I have to split: I have to distill
the numbers from the text. Below is my example and my solution.
x<-data.frame(x=c("aaa1_bbb1_ccc3","aaa2_bbb3_ccc2","aaa3_bbb2_ccc1"))
x
library(stringr)
out<-as.data.frame(str_split_fixed(x$x,"aaa",2))
out2<-as.data.frame(str_split_fixed(out$V2,"_bbb",2))
2017 Jul 27
2
na.rm = T treatment by ggplot2's geom_bar
Just a thought:
Did you try na.rm = TRUE in case you have an object named "T" in scope?
-- Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Thu, Jul 27, 2017 at 7:49 AM, Dimitri Liakhovitski
<dimitri.liakhovitski at
2017 Jul 27
3
na.rm = T treatment by ggplot2's geom_bar
Hello!
I am trying to understand how ggplot2's geom_bar treats NAs.
The help file says:
library(ggplot2)
?geom_bar
na.rm: If FALSE, the default, missing values are removed with a warning. If
TRUE, missing values are silently removed.
I am trying it out:
md <- data.frame(a = c(letters[1:5], letters[1:4], letters[1:3], rep(NA,
3)))
str(md); levels(md$a)
ggplot(data = md, mapping = aes(x =
2012 Mar 31
2
lm no calcula un coeficiente
Hola,
quiero hacer una regresión lineal
lm(y ~ x * grupo, data =datos)
y: numérica, x: numérica, grupo: factor con dos niveles (1 y 2)
pero no calcula el coeficiente de x:grupo2 a cuenta de una singularidad
Coefficients: (1 not defined because of singularities)
Estimate Std. Error t value Pr(>|t|)
(Intercept) -1.283e+06 2.276e+04 -56.359 < 2e-16 ***
x
2011 Feb 25
6
preventing repeat in "paste"
Hello!
s<-"start"; e<-"end"
middle<-as.character(c(1,2,3))
I would like to get the following result:
"start 123 end" or "start 1 2 3 end" or "start 1,2,3 end"
How can I avoide this (undesired) result:
paste(s,middle,e,sep=" ")
Thank you!
--
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com
2017 Jul 27
0
na.rm = T treatment by ggplot2's geom_bar
?hanks for the advice, Jeff. Will keep it in mind.
But I am anal - I shy away from using letters and words that "look
familiar" to me in R (such as mean, sd, T, etc.)
But still, it's a good advice.
On Thu, Jul 27, 2017 at 11:53 AM, Jeff Newmiller <jdnewmil at dcn.davis.ca.us>
wrote:
> I think you should be more suspicious of yourself, Dimitri. A letter T
> variable can
2017 Jul 27
0
na.rm = T treatment by ggplot2's geom_bar
To clarify: my question is not about "who could I exclude NAs from being
counted" - I know how to do that.
My question is: Why na.rm = T is not working for geom_bar in this case?
On Thu, Jul 27, 2017 at 8:24 AM, Dimitri Liakhovitski <
dimitri.liakhovitski at gmail.com> wrote:
> Hello!
>
> I am trying to understand how ggplot2's geom_bar treats NAs.
> The help file
2009 Apr 28
4
Producing customized tickmarks when producing a graph using "curve"
Hello!
I am using function "curve" to create a line graph.
I was wondering, if it's possible to "turn off" the default tick marks
and introduce those tick marks in specific locations.
For example, currently in my X axis tick marks are (automatically) at
10, 11, 12, 13 but I want them to be in 5 specific locations, like
9.89, 10.34, etc.
Any hint would be greatly
2009 Oct 13
4
replacing period with a space
Dear R-ers!
I have x as a variable in a data frame x.
x<-data.frame(x=c("aa.bb","cc.dd.ee"))
x$x<-as.character(x$x)
x
I am sorry for such a simple question - but how can I replace all
periods in x$x with spaces?
sub('.', ' ', x$x) - removes all letters to the left of each period...
Thanks a lot for your advice!
--
Dimitri Liakhovitski
Ninah.com
2010 Oct 01
3
Suppressing printing in the function
Hello!
I wrote a function that returns a data frame. Nowhere in the function
do I say print(my.data.frame), but when I run the function - the data
frame is printed on the console.
Is there any way to suppress it?
Thank you!
--
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com
2013 Jun 27
2
choicemodelr is misbehaving under R3.0
Hi John (and other authors of ChoiceModelR package),
I am experiencing a weird thing when using the function choicemodelr under
R3.0.1.
Before I updated to R3.0, I had used choicemodelr unde R2.15. It was always
as fast or faster than exactly the same task in Sawtooth software.
Now, I've tried to run it under R3.0.1. It seems to be doing the job. But
something is slowing it down dramatically.
2010 Mar 04
4
Analogue to SPSS regression commands ENTER and REMOVE in R?
I am not sure if this question has been asked before - but is there a
procedure in R (in lm or glm?) that is equivalent to ENTER and REMOVE
regression commands in SPSS?
Thanks a lot!
--
Dimitri Liakhovitski
Ninah.com
Dimitri.Liakhovitski at ninah.com