Displaying 20 results from an estimated 1000 matches similar to: "probability-probability plot"
2003 Oct 27
4
how to set missing values in R
Hi, there.
Can I ask how to set up missing values in R? Suppose I want to assign the
missing value to the elements in vector which is greater than zero like
this:
x<-c(1,3,-1,0,4);
after the missing value assignment, x becomes (NA,NA,-1,0,NA).
Thanks!
Yulei
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Yulei He
1586 Murfin Ave. Apt 37
Ann Arbor, MI 48105-3135
yuleih at umich.edu
2004 Oct 30
2
(no subject)
Hi, there.
Does anybody know how to plot a smooth density plot for some data
simulated from certain distribution? Thanks.
Yulei
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
Yulei He
1586 Murfin Ave. Apt 37
Ann Arbor, MI 48105-3135
yuleih at umich.edu
734-647-0305(H)
734-763-0421(O)
734-763-0427(O)
734-764-8263(fax)
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
2005 Jan 13
2
multivariate diagnostics
Hi, there.
I have two questions about the diagnostics in multivarite statistics.
1. Is there any diagnostics tool to check if a multivariate sample is from
multivariate normal distribution? If there is one, is there any function
doing it in R?
2. Is there any function of testing if two multivariate distribution are
same, i.e. the multivariate extension of Kolomogrov-Smirnov test?
Thanks for
2005 Feb 05
1
plot smooth density estimates for bivariate data
Hi, there.
Suppose I have a bivarariate data matrix y1 and y2. I want to plot a 3-D
picture of the estimated density f(y1, y2) against y1 and y2? How can I do
that? Do I use persp() or density()?
Thanks for your help.
Yulei
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
Yulei He
1586 Murfin Ave. Apt 37
Ann Arbor, MI 48105-3135
yuleih at umich.edu
734-647-0305(H)
734-763-0421(O)
734-763-0427(O)
2004 Nov 17
1
how to estimate conditional density
Hi, there.
Suppose I have a bivariate data set y1 and y2. Can anybody tell me how to
estimate the conditional density of f(y1|y2) and vice versa? Thanks.
Yulei
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
Yulei He
1586 Murfin Ave. Apt 37
Ann Arbor, MI 48105-3135
yuleih at umich.edu
734-647-0305(H)
734-763-0421(O)
734-763-0427(O)
734-764-8263(fax)
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
2004 Jul 16
0
for loops in Gibbs sampler
Dear all:
I am using R to do multiple imputation for longitudinal data set. The
Gibbs chain basically requires draw posterior distribution of model
parameters, including the random effects. The multiple imputation requires
several independent Gibbs chains. So my program structure is like:
for (chain in 1:5)
{
# perform Gibbs sampling...
for (row in 1:row.no)
{
b.row=some function # draw
2010 Jun 24
4
Simple qqplot question
I am a beginner in R, so please don't step on me if this is too
simple. I have two data sets datax and datay for which I created a
qqplot
qqplot(datax,datay)
but now I want a line that indicates the perfect match so that I can
see how much the plot diverts from the ideal. This ideal however is
not normal, so I think qqnorm and qqline cannot be applied.
Perhaps you can help?
Ralf
2005 Sep 26
2
questions about boxplots
Hi, there.
I have two questions about using R to create boxplots.
1. The function boxplot() plots the outliers. How can I label the exact
values arount these outlier points? Does R have an option allow me to
do that?
2. How can I put two boxplots in one x-y axis?
Thanks.
Yulei
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
Yulei He
276 Grove St. Apt 3
Newton, MA 02466
617-796-7834(H)
2009 Apr 26
3
Flipping axes of qqnorm
Hi all,
I have just started using R to produce qqnorm plots. I am trying to
switch the x and y axes so that the theoretical values are plotted on the y
axis and my data on the x axis. Can anyone help me with this?
Thanks
--
View this message in context: http://www.nabble.com/Flipping-axes-of-qqnorm-tp23248007p23248007.html
Sent from the R help mailing list archive at Nabble.com.
2003 Sep 08
1
P-P probability plots?
Hi,
I see that there is a standard function for Q-Q normal plots in R but
couldn't find anything for normal probability plots. To my eyeballs
the latter are easier to interpret. Is there a function in some
library or is there a standard way to use qqnorm to get them?
2006 May 17
1
can Box test the Ljung Box test say which ARIMA model is better?
two ARIMA models, both have several bars signicant in ACF and PACF plots of
their residuals,
but when run Ljung Box tests,
both don't show any significant correlations...
however, one model has p-value that is larger than the other model,
based on the p-values,
can I say the model with larger p-values should be better than the model
with smaller p-values?
[[alternative HTML version
2003 Jun 24
4
cumulative frequency distribution plot
Does R do cumulative frequency distribution plots?
--
Tommy E. Cathey, Senior Scientific Application Consultant
High Performance Computing & Scientific Visualization
SAIC, Supporting the EPA
Research Triangle Park, NC
919-541-1500 EMail: cathey.tommy at epa.gov
My e-mail does not reflect the opinion of SAIC or the EPA.
Federal Contact - John B. Smith
919-541-1087 - smith.johnb at epa.gov
2006 Feb 01
1
Difficulty with qqline in logarithmic context
Hi, R friends. I had some difficulty with the following code:
qqnorm(freq, log='y')
qqline(freq)
as the line drawn was seemingly random. The exact data I used appears
below. After wandering a bit within the source code for "abline",
I figured out I should rather write:
qqnorm(freq, log='y')
par(ylog=FALSE)
qqline(log10(freq))
par(ylog=TRUE)
2009 Nov 02
7
qqplot
Hi,
We could use qqplot to see how two distributions are different from each other. To show better how they are different (departs from the straight line), how is it possible to plot the straight line that goes through them? I am looking for some thing like qqline for qqnorm. I thought of abline but how to determine the slope and intercept?
Best wishes,
Carol
2011 Jan 20
2
auc function
Hi, there.
Suppose I already have sensitivities and specificities. What is the quick R-function to calculate AUC for the ROC plot? There seem to be many R functions to calculate AUC.
Thanks.
Yulei
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2006 Feb 13
2
bivariate normal distribution
Hi, there.
Does anyone know the R function for calculating the cdf of bivariate
normal distribution function?
Thanks.
Yulei
[[alternative HTML version deleted]]
2008 Mar 06
2
calculate AUC and plot ROC in R
Hi, there:
Could someone tell me a simple function of plot ROC curve and calculate
AUC in R? My setting is very simple, a column of the true binary
response and another column of predicted probabilities.
Thanks!
Yulei
[[alternative HTML version deleted]]
2010 Jul 13
6
create variables with indexes
Hi, there:
Suppose I want create variables with indexes in their names, e.g., X_1_1, X_1_2, X_1_3, ..., X_1_10, X_2_1, X_2_2, X_2_3, .. X_2_10,..., X_10_1, X_10_2, ... X_10_10. It looks like I need to use 2 indexes I and J so I is looped from 1 to 10, and J is looped from 1 to 10. But I don't know how to automatically produce X with these combination of indexes. Should I use paste function?
2008 Jun 11
1
specifying ranges in scatter plot
Hi, there:
Does anyone know how to specify the ranges in the axises when I make
scatter plots using pairs()? In the general plot function, I can use
xlim and ylim option. But how can I do this if I use pairs()?
Thanks.
Yulei
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2006 Apr 08
1
cross product
Hi, there.
How do I calculate the cross-product in the form of
\sum_{i=1}^{n}X_{i}^{t} \Sigma X_{i} using R code without using do loop?
X_{i} is the covariate matrix for subject I, \Sigma is the covariance
matrix.
Thanks for your help.
Yulei
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