Displaying 20 results from an estimated 3000 matches similar to: "(1-alpha)th percentile"
2008 Jun 08
2
multinormality
is there any function under R that allows me to test the normality of my 92
sumples?
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2008 May 18
2
how can i superpose 2 graphs
Hio
i tried to do this by:
par(new=TRUE)
but the result is one picture but y-axis has 2 diff?rent graduations.how can
i correct this?( i want one graduation on y axis).
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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
2008 May 29
2
lm() function
hi,
my linear model is y=c+a*x1+b*x2 i tried to found a, c, b by the use of:
mymodel<-lm(y~1+x1+x2) where y, x1, x2 are 3 vectors with the same length
the result is a=NA.so i want to know where is the problem.
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2008 May 19
2
i want to export a data.frame to file.xls
in order to export a data.frame to sheet.xls i try:
write(df,file="file_name.xls")
but when i open it a message appears:
"impossible to oppen this file. her format is unvalid"
knowen that i work with excel_2007
what is the solution ?
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2008 May 18
3
two curves at one graph
i try to use par(new=TRUE) i get them at the same graph but the y_axis and
x_axis are drowen with two unevenly graduations that graph become
unreadable.
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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
2008 May 19
2
how can i sort a column of data.frame ?
i have a data.frame with several columns that i want to sort one of them (one
column) by descending order
in such way that this sorting out recover all colums. what should i do?
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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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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,
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
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
2017 Aug 16
1
Bias-corrected percentile confidence intervals
Hi folks,
I'm trying to estimate bias-corrected percentile (BCP) confidence
intervals on a vector from a simple for loop used for resampling. I am
attempting to follow steps in Manly, B. 1998. Randomization, bootstrap
and monte carlo methods in biology. 2nd edition., p. 48. PDF of the
approach/steps should be available here:
https://wyocoopunit.box.com/s/9vm4vgmbx5h7um809bvg6u7wr392v6i9
If
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.
2011 Jan 02
3
The Percentile of a User-Defined pdf
I would like to give a probability distribution function of a function of
(x,y) on the half-plane y>0, and a constant 0<c<1 and I would like to know
the c percentile of the marginal distribution of x. I have tried along
the lines of the following but I keep getting errors:
# SIMPLIFIED PROBLEM
# The plan is to solve for the .975 percentile "xc" of the marginal x
distribution
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
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)
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
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
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