Displaying 20 results from an estimated 506 matches for "deviates".

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2012 Aug 25

5

Standard deviation from MANOVA??

Hi,
I have problem getting the standard deviation from the manova output.
I have used the manova function: myfit <- manova(cbind(y1, y2) ~ x1
+ x2 + x3, data=mydata) .
I tried to get the predicted values and their standard deviation by using:
predict(myfit, type="response", se.fit=TRUE)
But the problem is that I don''t get the standard deviation values, I

2007 Oct 21

3

scatter plot with 1 standard deviation for each point

Hi,
Could anyone give suggestions how to plot a scatter plot with 1 standard
deviation for each point. To make it clearer, here is a simple example: the
scatterplot is plot(X, Y), but I want to add 1 standard deviation according
to the value of Z for each Y.
X Y Z
1 3.5 1.1
. . .
. . .
. . .
Thanks a lot in advance.
FD
[[alternative HTML

2017 Sep 13

2

Help in R

I don?t know if my question is answerable, but it is worth a try. I have a data set that I am trying to analyze in R for a course and the instructions were to get a standard deviation which I already computed in R and use that number and change it to a biased standard deviation?.(I have the two equations and I understand the difference between the two and how the unbiased has the degree of

2010 Feb 09

4

Model matrix using dummy regressors or deviation regressors

The model matrix for the code at the end the email is shown below.
Since the model matrix doesn''t have -1, I think that it is made of
dummy regressors rather than deviation regressors. I''m wondering how
to make a model matrix using deviation regressors. Could somebody let
me know?
> model.matrix(aaov)
(Intercept) A2 B2 B3 A2:B2 A2:B3
1 1 0 0 0 0 0
2

2003 Sep 22

3

weighted standard deviation

Dear all,
is there an implemented function to compute a
weighted standard deviation (-like weighted.mean-) in R ?
Thank''s a lot in advance
Johannes Schnitzler

2011 Mar 19

2

Output a table formatted with standard deviations below means

Is it in bad form to double post to StackOverflow and R-help? Apologies if
so. Here''s my task:
I''ve got a matrix of means like so
means<-matrix(1:10,nrow=2)
colnames(means)<-c("a","b","c","d","e")
and a matrix of standard deviations like so
sds<-matrix(seq(0.1,1,by=0.1),nrow=2)

2008 Feb 18

3

Custom Plot - means, SD & 5th-95th% (Plotmeans or Boxplot)?

Any help with this problem would be greatly appreciated:
I need to produce a custom plot i haven''t come across in R. Basically, I
want to show means, 1st standard deviation and 5th and 95th percentiles
visually, using something resembling a boxplot. Is it possible to completely
customize a boxplot so that it shows means as the bar (instead of, not as
well as medians), standard deviations

2004 Jul 13

0

Calculating sum of squares deviation between 2 similar matrices

Hi all,
I''ve got clusters and would like to match individual records to each
cluster based on a sum of squares deviation. For each cluster and
individual, I''ve got 50 variables to use (measured in the same way).
Matrix 1 is individuals and is 25000x50. Matrix 2 is the cluster
centroids and is 100x50. The same variables are found in each matrix
in the same order.

2008 Oct 09

1

GWR Predictions'' standard deviation

Dear all,
I would like to use a GWR model in order to spatially predict food
insecurity in Africa. I have a georeferenced village data-bases and I''ve run
a "classic" regression model (taking into account the spatial dependence of
the errors) that works fairly well for Niger that is a quite homogenous
country. Now, I would like to make the same thing for countries where it

2013 Oct 15

1

randomForest: Numeric deviation between 32/64 Windows builds

Dear R Developers
I''m using the great randomForest package (4.6-7) for many projects and recently stumbled upon a problem when I wrote unit tests for one of my projects:
On Windows, there are small numeric deviations when using the 32- / 64-bit version of R, which doesn''t seem to be a problem on Linux or Mac.
R64 on Windows produces the same results as R64/R32 on Linux

2003 May 30

2

Normal deviate generation - Marsaglia''s ziggurat method

Hi:
I was wondering why Marsaglia''s new ziggurat method for generating
deviates from the standard normal distribution has not been implemented
in the R base package. I know that it is available in SuppDists
pacakage of Bob Wheeler, as "rziggurat". According my timing tests, it
is about 6 to 7 times faster (on a Pentium 2.4 MHz) machine than the
default Inversion...

2011 May 22

4

How to calculate confidence interval of C statistic by rcorr.cens

Hi,
I''m trying to calculate 95% confidence interval of C statistic of
logistic regression model using rcorr.cens in rms package. I wrote a
brief function for this purpose as the followings;
CstatisticCI <- function(x) # x is object of rcorr.cens.
{
se <- x["S.D."]/sqrt(x["n"])
Low95 <- x["C Index"] - 1.96*se
Upper95 <-

2010 Nov 23

3

How to do a stochastic model in R

Dear all of you,
I would like to get some help from you.
Here I attach you a model, that I would like to be stochastic so I would need each time the value of x changed, the values of parameters (ss, emrg, gf, spp, sr) did too according to a normal distribution, with mean its value and standard deviation given by the parameter name preceded by SDV (In the case of parameter ss, mean is 0.3 and

2011 Aug 19

0

sign of the y axis in partialPlot for randomForest regression

Hi everybody,
I used randomForest to regress invertebrates abundances in least impaired
river reaches from some environmental parameters. Then I used these models
to predict invertebrates abundances in impaired reaches.
Now I would like to model the deviation (observation - prediction) with a
set of chemical parameters to see if the deviations from predictions could
be explained with water

2012 Jan 15

0

A question about cointegration - How can we find the standard deviation in the cointegration relationship ?

Hello,
I am using urca package to run cointegration. I would like to find the
standard error in the (normalized, Johansen) cointegration relationship. How
can I do it?
As far as I know, The function "cajorls" in the "urca" package provides
the normalized cointegrating relationships. Nevertheless, it does not
provide the standard deviation of the coefficient for each

2017 Jun 15

0

Estimating Unbiased Standard Deviation with Autocorrelation

Hello,
I have a vector of values with significant autocorrelation, and I want to calculate an unbiased standard deviation that adjusts for the autocorrelation. The formula linked below purports to provide what I want:
https://en.wikipedia.org/wiki/Unbiased_estimation_of_standard_deviation#Effect_of_autocorrelation_.28serial_correlation.29
However, rather than just implementing

2011 Jun 30

2

sdev value returned by princomp function (used for PCA)

Dear all,
I have a question about the ''sdev'' value returned by the princomp function (which does principal components analysis).
On the help page for princomp it says ''sdev'' is ''the standard deviations of the principal components''.
However, when I calculate the principal components for the USArrests data set, I don''t find this to be

2010 May 30

2

Question about package coin

Anyone know if coin can run a permutation test based on a (user-defined) statistic other than the mean difference? The function independence_test does the permutation t-test via difference in means. I''m wondering if it''s possible to use independence_test to run a permutation test for some other statistic than the difference in means. For example, I''d like to run a

2004 Apr 29

0

Maen squared deviation

Dear list,
i''m looking for how to get the mean squared deviation in R. I tried a lot of
(complicated) instructions, sometimes the worked, but now i''m looking for an
easier one....Hope you can help - greetings.

2006 Feb 16

0

sums of absolute deviations about the median as split function in rpart

Dear R community,
as stated in Breiman et.al. (1984) and De''Ath & Fabricius (2000) using
sums of absolute deviations about the median as an impurity measure
gives robust trees.
I would like to use this method in rpart.
Has somebody already tried this method in rpart? Is there maybe already
a script available somewhere?
I am aware of the possibility to define usersplits myself with