Displaying 20 results from an estimated 1000 matches similar to: "Percentile Estimation From Kernel Density Estimate"
2004 Apr 06
2
percentile-percentile plot
Hi,
Is there a function that does percentile-percentile plot. I do not mean
the qqplot. I need to plot the percentiles rather than points themselves.
I am hoping for a plot that tells me that the x percentile of one data set
corresponds to the y percentile of the other. for example a point on the
plot of (.5, .2) will tell me that the 50th percentile of the first data
and the 20th percentile of
2011 Dec 23
3
data vector to corresonding percentile ranks
I have a problem where I need to calculate the corresponding cohort
percentile ranks for each of several variables.
Essentially, what I need is a function that will calculate the
distribution-free percentiles from each variable's data vector, returning a
corresponding vector of percentiles:
e.g.:
percentile.my.data<-/function/(my.data)
I tried to make ecdf() perform this task but
2007 Jun 18
2
Calculating Percentile in R
Hi all,
I have a problem on how R calculates Percentiles :
Suppose I have following data set:
> data1
[1] -16648185 -14463457 -14449400 -13905309 -13443436 -13234755 -12956282 -11660896
[9] -10061040 -9805005 -9789583 -9754642 -9562164 -9391709 -9212182 -9151073
[17] -9092732 -9068214 -8978151 -8943912 -8761890 -8632106 -8541580 -8501249
[25] -8234466 -8219015
2012 Nov 08
3
difference percentile R vs SPSS
Dear list,
I am calculating the 95th percentile of a set of values with R and with SPSS
In R:
> normal200<-rnorm(200,0,1)
> qnorm(0.95,mean=mean(normal200),sd=sd(normal200),lower.tail =TRUE)
[1] 1.84191
In SPSS, if I use the same 200 values and select Analyze -> Descriptive Statistics -> Frequencies
and under "Statistics", I type in '95' under Percentiles,
2012 Sep 28
1
z-score to percentile, and back again (Normal)
In R, what is the best way to convert z-scores (Normal distribution) to a percentiles, and vice-versa.
(I'll be looking to do the same with other distributions eventually.)
===
Peter Petto <ppetto at ppetto.com>
Bay Village, OH 440.249.4289
2010 May 28
1
create new variable: percentile value of variable in data frame
Hello all,
Thanks in advance for you attention.
I would like to generate a third value that represents the quantile
value of a variable in a data frame.
# generating data
x <- as.matrix(seq(1:30))
y <- as.matrix(rnorm(30, 20, 7))
tmp1 <- cbind(x,y)
dat <- as.data.frame(tmp1)
colnames(dat) <- c("id", "score")
dat
# finding percentiles of "score"
2000 Oct 17
2
Percentile function
Is there an R function that inputs a value and a vector, and
returns the percentile corresponding to the value?
Something like
pvalue<-function(x,vector){mean(x>=vector)}
but with interpolation.
Given the above function, is there a way to do the following
without the loop:
for(i in 1:10) y[i] <- pvalue(x[i],vector)
where x and y are numeric vectors of length 10?
--
Art Salwin
2013 Jan 03
1
Inserting percentile values in a data frame
Hello
I need to calculate and insert the values for the 50,75,90,95 & 99
percentiles in a data frame for each row.
I used agr1$quantile <- quantile(agr1$cnt, probs=c(.50, .75, .90, .95, .99))
but that didn't work.
How can calculate the percentile for my variable "cnt" , insert & name the
percentile as p50, p75, etc
in my data frame agr1?
Thanks in advance for your
2011 May 25
3
how to compute the inverse percentile of a given observation w.r.t. a reference distribution
Hi,
can anyone help me to figure out how to compute the percentile of an
individual observation with respect to a reference distribution.
What I mean is. Let's assume I have a vector consisting of 10 numbers
{3,5,8,1,9,5,4,3,5.5,7} and I want figure out what percentile the
number 4.9 corresponds to. I failed to find any reference to such a
function, although I would assume this must
2005 Oct 18
1
A two-part question about box-percentile plots, bpplot(): (1) yaxt="n" doesn't seem to work (2) how to display mean values
Dear List,
I have a two-part question related to bpplot(), a box-percentile plot
function in the Hmisc package.
Take the example given in the Help for bpplot(), for instance.
(1) How does one set but not draw the y-axis? What I did was,
bpplot(... , yaxt="n"), but that apparently does not work (though it
works for boxplot()).
(2) How does one display the mean value of each variable
2002 Jun 05
1
How to put values of 25 and 75 percentile on boxplot?
Hi all,
One quick question:
How to put values of 25 and 75 percentile on boxplot?
Thanks in advance.
Nianqing Xiao, Ph.D
NCI Center for Bioinformatics, NIH
SAIC/Advanced Systems Group
> 6116 EXECUTIVE BLVD 4026J
> MSC 8335
> BETHESDA MD 20852
Phone: 301-451-6357
Fax: 301-480-4222
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list --
2002 Aug 09
0
percentile labels in qqnorm
Hi-
I wanted percentage labels on a qqnorm x axis. I used the following:
#make up some data
jt<-rnorm(100)
#qqnorm with percentile x labels
qqnorm(jt,axes=F,xlab="Percentiles")
box()
l<-c(1,5,10,30,50,70,90,95,99)
axis(1,at=qnorm(l/100),label=l)
which was ok for this data set.
Does anyone have a more general solution which would allow one to
specify the number of x labels
2009 Mar 13
1
TZInfo included in Rails 2.2.2 vs. version on RubyForge
I downloaded version 0.3.12 of TZInfo from [1], and observed that it
has a very robust set of timezones including, for example, ''America/
Anchorage'':
irb(main):001:0> require ''rubygems''
=> false
irb(main):002:0> require ''tzinfo''
=> true
irb(main):003:0> TZInfo::Timezone.get(''America/Anchorage'')
=>
2010 Sep 07
2
Percentile rank for each element in list
Heeeelp
Given this data
x <- c(1,5,100,300,250,200,550,900,1000)
> quantile(x)
0% 25% 50% 75% 100%
1 100 250 550 1000
When I run the quantile, I can only know the value of the nth
percentile
I want to know what's the percentile position of each items in the
list
Sample
1 = 100% on the list has 1 or more
5 = more than x% on the list has 5 or more
100 = more than x% on the
2008 May 16
1
(1-alpha)th percentile
hello;
firstly, my gratitude to all who help me to find a function that allows me
to add confidence interval to my graph.
in order to calculate the (1-alpha)th percentile of for exemple an
F(df1,df2) distribution i do like this:
v<-df(alpha,df1,df2)
percentile<-qf(v,df1,df2,alpha)
if it is true please alert me , and if it is not what should do then?
:handshake:
--
View this message in
2009 Aug 18
2
value of nth percentile
Dear All,
I have to get the value of say 90th percentile of precipitation time series.. The series is of daily precipitation value of 96 years, I have to to get 90the percentile value of daily precipitation each year. If you know the R code or command for this please let me know.
I would appreciate your early response.
Thanking you,
Sincerely,
Ajay.
2008 May 16
1
Lattice box percentile plot
Dear Nabble.
I am trying to draw a box percentile plot with trellis using the panel in
Hmisc. I really want to colour the plots in. I can alter several of features
of the plot by changing the trellis par settings but I just can’t fill the
shape in.
Here is some example code which alters line colour and dot symbol:
require(lattice)
require(Hmisc)
2012 Mar 03
3
percentile of a given value: is there a "reverse" quantile function?
Dear all,
I am familiar with obtaining the value corresponding to a chosen
probability via the quantile function.
Now I am facing the opposite problem I have a value an want to know it's
corresponding percentile in the distribution. So is there a function for
this as well?
Thank you for your support in advance, Felix
2012 Nov 05
2
Replace array with percentile values
Hi:
I have an array of measurements, that I've been doing linear
regression model and AI models on. Because there are many errors and
the values are "ill-formed" I would like to copy the array, but
replace each value with the PERCENTILE of that value, in the original
array.
i.e.
mesments$V1: 9, 77, -1
would become: mesmentsCopy$V1: 50, 100, 0
The actual array has many more
2009 Mar 04
3
Diff btw percentile and quantile
To calculate Percentile for a set of observations Excel has percentile()
function. R function quantile() does the same thing. Is there any
significant difference btw percentile and quantile?
Regrads,
--
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