Displaying 20 results from an estimated 3000 matches similar to: "hist(x, ...) with normal distribution curve"
2001 Oct 13
2
hist and normal curve
Dear R people:
I would like to superimpose a normal curve on a histogram.
I've seen this example in a book, somewhere.
I know that you draw the hist, get the mean and sd
of the data set, but then I'm stuck.
Could you help, please?
Thanks!
Erin
hodgess at uhddx01.dt.uh.edu
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2009 Sep 02
2
Howto fit normal curve into histogram using GGPLOT2
Currently, I am doing it this way.
x <- mtcars$mpg
h<-hist(x, breaks=10, col="red", xlab="Miles Per Gallon",
main="Histogram with Normal Curve")
xfit<-seq(min(x),max(x),length=40)
yfit<-dnorm(xfit,mean=mean(x),sd=sd(x))
yfit <- yfit*diff(h$mids[1:2])*length(x)
lines(xfit, yfit, col="blue", lwd=2)
But since, ggplot2 has more appealing
2011 Mar 03
3
Probabilities greather than 1 in HIST
Dear all,
I am a newbie in R and could not find help on this problem. I am trying to
plot an histogram with probabilities in the y axis. This is the code I am
using:
#TLC uniform
n=30
mi=1; mx=6
nrep=1000
xbar=rep(0,nrep)
for (i in 1:nrep) {xbar[i]=mean(runif(n,min=mi,max=mx))}
hist(xbar,prob=TRUE,breaks="Sturges",xlim=c(1,6),main=paste("n =",n),
xlab="Média",
2010 Sep 21
5
Combined plot: Scatter + density plot
Hi,
in order to save space for a publication, it would be nice to have a
combined scatter and density plot similar to what is shows on
http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=78
I wonder if anybody perhaps has already developed code for this and is
willing to share. This is the reproducible code for the histogram
version obtained from the site:
def.par <-
2010 Nov 10
1
par mfrow in "function" problem
Hi all,
I defined the following
#############################
myhist=function(x){
hist(x,xlab="",main="")
h=hist(x)
xfit=seq(min(x),max(x),length=100)
yfit=dnorm(xfit,mean(x),sd=sd(x))
yfit=yfit*diff(h$mids[1:2])*length(x)
lines(xfit, yfit, col="blue", lwd=2)
}
#############################
individually, it worked fine
however, if I used
par(mfrow=c(2,2))
2005 Oct 14
1
lattice with predicted values
Dear lattice wizards,
I am trying to figure out how to plot predicted values in xyplot,
where the intercept, but not the slope, varies among conditioning
factor levels. I am sure it involves the groups, but I have been
unsuccessful in my search in Pinhiero and Bate, in the help files, or
in the archive, or in my attempts on my own.
My example follows:
FACT is a factor with levels a,b,c
2010 Feb 19
1
"Legend" question
Hi,
I want to get a histogram with the legend for my data. I drew a normal density curve and kernel density curve in the histogram, and I also label mean and median in the X axis. From the code, I got two legend: One shows "Normal Density" and "Kernel Density" and their corresponding lines, the other shows "Mean = value" and "Median = value" and their
2005 Aug 12
6
evaluating string variables
Hello!!!
I have a folder (C:/R/) with matrix files, named by number, i.e.
0.mat, 1.mat,...,1250.mat. In this case, they are 5x5 simetric
matrices. I would like to compute a property for each matrix and put
calculated values into a data frame for posterior ploting and
printing. Below there is an example for 7 matrices (0.mat..6.mat)
#define data frame
L <- data.frame(frame=numeric(7),
2006 Feb 17
4
showing the integrated number by point size
Is there any function to show the points like this example of SPSS?
http://biostatistic.de/temp/reg.jpg
The point size should represent the number of data at this point.
with regards
Knut Krueger
2005 Jul 12
5
High resolution plots
Is there any possibility to get high resolution plots in a windows xp
system?
I tried it with the device function png(filename =
"c:/r/highresplot%d.png",pointsize=12, res=900)
but when I try to set: width = 480, height = 480 or pointsize = 12,
the text is not scaled in the same way as the plots.
with regards
Knut Krueger
http://www.biostatistic.de
2009 Dec 23
7
String question
Hi to all
I need a string like
temp <- paste("m1","m2","m3",sep=",")
But i must know how many items are in the string,afterwards
the other option would be to use a vector
temp <- c("m1","m2","m3")
No problem to get the count of items but I must get afterwards the
string "m1,m2,m3"
No problem to build the
2010 Feb 23
5
deleting column from data frame
Hi to all,
test <- data.frame("X"=c(1:4),"Y"=c(5:8),"Z"=c(8:11))
test <- test[,-2]
Is there a way to specify the col name "Y" to delete instead the number?
Kind regards Knut
2000 Nov 09
2
simple mixture
Dear All,
I am trying to do some simple mixture analyses. For instance, I have a
sample of n observations and I suspect they come from two different
exponential distributions with parameters rate1 and rate2, respectively.
So, I want to estimate rate1, rate2, and the proportions of both kinds of
individuals in the sample. I had a look at the packages mda and mclust, but
they do not seem to do this
2005 Jul 13
3
texture in barplots?
Dear R list,
For some reason I am unable to access neither search.r-project.org, nor
http://finzi.psych.upenn.edu/ so I cannot search the archives for a possible
answer (I Googled for this but didn't find anything).
Is it possible to draw barplots using a texture instead of colors, for a black
and white printer?
TIA,
Adrian
--
Adrian Dusa
Arhiva Romana de Date Sociale
Bd. Schitu
2005 Aug 09
5
RGUI crash when opening script in XP Home enviroment
If there is a helpfile open (f.e ?glm) and it is the top window, then
an exception error occurs (closing RGUI)
when I hit the open file button.
If the helpfile is not the top window (of the RGUI) I am able to open a
new script without any error.
The RGUI is not closing complete there is a blank screen left which I
have to close with the X Button or Taskmanager
Windows XP Home - German Version
2010 May 18
5
looking for .. dec if vector if element > x
Hi to all,
I am just looking for more efficient ways ;-)
is there a better way instead a loop to decrease x if greater y
test <- c(1,3,5,7,9)
decrease if greater 1 to
test2 <- c(1,2,4,6,8)
Kind regards
Knut
2011 Mar 25
4
read.xls -> rotate data.frame
Hi to all,
how could I to rotate automatically a data sheet which was imported by
read.xls?
x1 x2 x3 .... xn
y1 1 4 7 ... xn/y1
y2 2 5 8 .... xn/y2
y3 3 6 9 ....xn/y2
yn ... ... ... Xn/Yn
to
y1 y2 y3 .... yn
x1 1 2 3 ..... Yn/x1
x2 4 5 6 .... Yn/x2
x3 7 8 9 .... Yn/x2
xn ... ... ... ..... Yn/xn
Kind regards Knut
2007 Jun 07
2
Nonlinear Regression
Hello
I followed the example in page 59, chapter 11 of the 'Introduction to R'
manual. I entered my own x,y data. I used the least squares. My function has
5 parameters: p[1], p[2], p[3], p[4], p[5]. I plotted the x-y data. Then I
used lines(spline(xfit,yfit)) to overlay best curves on the data while
changing the parameters. My question is how do I calculate the residual sum
of squares.
2010 Jul 21
4
Chi-square distribution probability density function:
Hi to all I found
an formular of an **
***p-Value Calculator for the Chi-Square test*
*http://www.danielsoper.com/statcalc/calc11.aspx*
*with the formula*
*http://www.danielsoper.com/statkb/topic11.aspx*
*what's the gamma function of this formula in r?*
*df=5*
*ch2=25.50878*
*the following code does not give the result <0.001 for the values above *
*p=
2007 Aug 16
7
combining P values using Fisher's method
Hi All,
Can somebody tell me how to use R to combine p values using Fisher's method? thanks.
Jiong
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