Displaying 20 results from an estimated 2000 matches similar to: "hist and normal curve"
2005 Sep 25
4
hist(x, ...) with normal distribution curve
.
I am looking for a histogram or box plot with the adding normal
distribution curve
I think that must be possible, but I am not able to find out how to do.
Regards Knut
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
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
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.
2012 Aug 06
4
Overlay Histogram
Dear all,
For two sets of random variables, say, x <- rnorm(1000, 10, 10) and y
<- rnorm(1000. 3, 20).
Is there any way to overlay the histograms (and density curves) of x and y
on the plot of y vs. x?
The histogram of x is on the x axis and that of y is on the y axis.
The density curve here is to approximate the shape of the distribution
and does not have to have area 1.
Thank you
2005 Oct 14
2
Help with lattice, regressions and respective lines
# Dear R list,
#
# I'm needing help with lattice, regression and respective lines.
# My data is below:
bra = gl(2, 24, label = c('c', 's'))
em = rep(gl(3, 8, label = c('po', 'pov', 'ce')), 2)
tem = rep(c(0, 0, 30, 30, 60, 60, 90, 90), 6)
tem2 = tem^2
r = rep(1:2, 24)
y = c(40.58, 44.85, 32.55, 35.68, 64.86, 51.95, 42.52, 52.21,
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),
2001 Oct 13
1
hist with relative frequency
Dear R People:
Here is yet another histogram question (yahq), please:
When I use the hist() command with
freq=F, I get density on the side.
I would really like to have relative frequency; that is,
Rf = density/(sum(density))
Is there a step that I'm leaving out, please?
thanks!
Sincerely,
Erin
hodgess at uhddx01.dt.uh.edu
2008 Aug 04
2
Howto Smooth a Curve Created with the Point Function
Hi all,
I have this figure:
http://docs.google.com/Doc?id=df5zfsj4_103rjt2v4d5
created with the following steps:
> x
[1] 90.4 57.8 77.0 103.7 55.4 217.5 68.1 85.3 152.0 113.0 97.1 89.9
[13] 68.1 83.7 77.4 34.5 104.9 170.3 88.6 88.1 108.8 77.4 85.6 82.7
[25] 81.3 108.0 49.5 71.0 85.7 99.3 203.5 275.9 51.1 84.8 16.5 72.6
[37] 160.5 158.3 136.7 140.0 98.4 116.1
2006 Sep 28
3
complex plots using layout()
Dear r-help,
I am trying to plot several scatter plots with marginal histograms on
one page. Ideally, a page is equally divided into 4 figure regions.
Within each figure region, a scatter plot with marginal histograms will
be plotted.
I followed Dr. Paul Murrell's code released online to successfully plot
the scatter plot with marginal histograms. The code applies "layout()"
to
2003 Apr 02
4
Multivariate Time series
Dear R People:
Is there a library for Multivariate time series, please?
For some reason, I'm thinking that Dr. Paul Gilbert may have one?
R Version 1.6.2 (i've updated!) for Windows
Thanks so much!
Sincerely,
Erin Hodgess
University of Houston - Downtown
mailto: hodgess at uhddx01.dt.uh.edu
2009 Oct 09
1
Substituting the extracted coefficients into the formula, exctracted from the result of nls()
Dear all,
Here I come with another stupid question. Suppose I want to use nls()
to fit a series of data (here modelled by generated points), then plot
the points and the fitting curve. I figured out some way of doing it:
x <- runif(1:20, 0, 10)
y <- 0.1*x^2 - rep(3, length(x)) + rnorm(length(x), sd = 0.5)
yfit <- nls(y ~ a*x^2 + b*x + c,
start = list(a = 1, b = 1, c = 1),
2009 Jun 21
2
Help on qpcR package
I am using R on a Windows XP professional platform.
The following code is part of a bigger one
CODE
press=function(y,x){
library(qpcR)
models.press=numeric(0)
cat("\n")
dep=y
print(dep)
indep=log(x)
print(indep)
yfit=dep-PRESS(lm(dep~indep))[[2]]
cat("\n yfit\n")
print(yfit)
yfit.orig=yfit
presid=y-yfit.orig
press=sum(presid^2)
2002 Feb 22
3
Cent. Mov. Ave
Dear R People:
Here is an interesting question(I think)
Suppose I want to calculate Centered Moving Averages; i.e.
x[1] <- ( sum(y[1:12]) )/12
x[2] <- ( sum(y[2:13]) )/12
and so on.
Of course, this is easily done through loops. However, I have
been trying to do this more elegantly, but have failed. I have
tried things like
j1 <- 1:109
j2 <- 12:120
x[1:109] <- ( sum( y[j1:j2])
2002 Oct 01
1
High Frequency Time Series
Dear R People:
I have a weekly time series. How do I put this into the
ts command, please?
That is, what do I use for frequency, please?
R version 1.5.1 for Windows.
Thanks in advance.
Sincerely,
Erin
mailto: hodgess at uhddx01.dt.uh.edu
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