Displaying 20 results from an estimated 2000 matches similar to: "Weighted Sensitivity, PPV etc."
2012 Sep 13
1
Package for comparing sensitivity, specificity, PPV, NPV, and accuracy?
Hi, I have two sets of sensitivity, specificity, positive predictive
value, and negative predictive value, and accuracy from two tests on
the same subjects. Is there an R package that does such paired
comparisons?
Thanks,
Gang Chen
2008 Aug 20
0
Business Analyst must be local to MA
Hopkinton, MA.
Business Analyst
Pay rate 40.00
Candidate must be local or commuting distance. Client will ONLY do a face
to face interview
The successful candidate will work with the IT Marketing Portfolio and
Project Management Group.
REQUIRED SKILLS
*Experience with web design projects, social media, working with offshore
teams and a background in Marketing are highly desirable.*
2010 Jul 08
1
mimic SPSS contingency table results
Dear all
Seems that puzzles always come in packs. I was asked to help with some
statistics in blood analysis. (You can not refuse your wife's asks :-).
She has contingency table for values IgVH mutation and ZAP expression. I
can do chi-square test (in R) and get a results, and with some literature
I can try explain them. However she found an article in which they use
SPSS and use
2005 Nov 30
3
calculating IRR (accounting) in R
I am trying to replace a spreadsheet model of a project justification
with an R script.
I can't seem to track down R functions to calculate Internal Rate of
Return and NPV? Am I missing something? NPV doesn't seem so difficult
to calculate (at least for a regular series) but I am struggling to
identify how to solve for IRR in R.
It would be sufficient if it worked for a regular
2006 Jan 05
4
ylim problem in barplot
R Version 2.2.0
Platform: Windows
When I use barplot but select a ylim value greater than zero, the graph
is distorted. The bars extend below the bottom of the graph.
For instance the command produces a problematic graph.
barplot(c(200,300,250,350),ylim=c(150,400))
Any help would be appreciated.
Paul
[[alternative HTML version deleted]]
2005 May 31
3
lars / lasso with glm
We have been using Least Angle Regression (lars) to help identify
predictors in models where the outcome is continuous. To do so we have
been relying on the lars package. Theoretically, it should be possible
to use the lars procedure within a general linear model (glm) framework
- we are particular interested in a logistic regression model. Does
anyone have examples of using lars with logistic
2005 Jun 06
1
RE: LOA for CFA . . work up "pencil copy"
David,
I guess I'm a little confused here. Are you asking me to provide a "pencil
copy" of an LOA for your review? I don't understand why you need an LOA
from us. We need an LOA from you to order circuits that will be billed to
us that will be attached to your CFA. It was also my understanding that you
had an LOA ready to be given to us, which had already been reviewed by
2005 Sep 09
2
Simulate phi-coefficient
Looking for help with the following problem.
Given a sample of zeros and ones, for example:
> VECTOR1<-rep(c(1,0),c(15,10))
> VECTOR1
[1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0
How would I create a new sample (VECTOR2) also containing zeros and
ones, in which the phi-coefficient between the two sample vectors was
drawn from a population with a known
2008 Nov 27
1
Inheritance of ACLs with Samba
Hello dear list members
I am not an experienced user of Samba, so I can be committing some basic
mistake, but it seems to me that there is something wrong with the way
Samba propagates ACLs. I tried versions 3.0.32 and 3.2.4 and the result
is the same. This happens with "map acl inherit = yes" on smb.conf.
I have a directory (dir) with the following ACLs:
# file: dir
USER Admin
2005 Sep 27
1
Simulate phi-coefficient (correlation between dichotomous vars)
Newsgroup members,
I appreciate the help on this topic.
David Duffy provided a solution (below) that was quite helpful, and came
close to what I needed. It did a great job creating two vectors of
dichotomous variables with a known correlation (what I referred to as a
phi-coefficient).
My situation is a bit more complicated and I'm not sure it is easily
solved. The problem is that I must
2009 Oct 14
0
Confusion matrix from cross validation in R:
Hey!
How do I get the confusion matrix after performing 10-fold cross validation
from SVM in R?
When I try to print it, I get the confusion matrix without cross validation.
I need to compute PPV. Should I report PPV without CV and total accuracy
with CV?
I am confused.
> svmtrain <- svm(xtrain,ytrain,kernel="sigmoid",cross=10)
> pred <- predict(svmtrain, xtrain)
>
2005 Jan 19
2
Moving fileserver
I'm having a problem here I'm not sure how to solve, so I
hope someone else have done the same (and succeeded :)
I have an old smb server ('tux') which is ancient (both
in software and hardware) and can't handle the load.
This machine is running version 2.2.3a-14.1 (Debian
GNU/Linux woody) with 'character set = ISO8859-1'.
The new smb server ('bella') runs
2008 Oct 13
4
Fw: Logistic regresion - Interpreting (SENS) and (SPEC)
Dear Mr Peter Dalgaard and Mr Dieter Menne,
I sincerely thank you for helping me out with my problem. The thing is taht I already have calculated SENS = Gg / (Gg + Bg) = 89.97%
and SPEC = Bb / (Bb + Gb) = 74.38%.
Now I have values of SENS and SPEC, which are absolute in nature. My question was how do I interpret these absolue values. How does these values help me to find out wheher my model is
2006 Jun 28
1
Simulate dichotomous correlation matrix
Newsgroup members,
Does anyone have a clever way to simulate a correlation matrix such that
each column contains dichotomous variables (0,1) and where each column
has different prevalence rates.
For instance, I would like to simulate the following correlation matrix:
> CORMAT[1:4,1:4]
PUREPT PTCUT2 PHQCUT2T ALCCUTT2
PUREPT 1.0000000 0.5141552 0.1913139 0.1917923
PTCUT2
2006 Aug 24
2
Why are lagged correlations typically negative?
Recently, I was working with some lagged designs where a vector of
observations at one time was used to predict a vector of observations at
another time using a lag 1 design. In the work, I noticed a lot of
negative correlations, so I ran a simple simulation with 2 matched
points. The crude simulation example below shows that the correlation
can be -1 or +1, but interestingly if you do this
2016 Jan 19
2
HDD badblocks
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
I suspect that the gold layer on edge connectors 30-odd years ago was
a lot thicker than on modern cards. We are talking contacts on 0.1"
spacing not some modern 1/10 of a knat's whisker. (Off topic) I also
remember seeing engineers determine which memory chip was at fault and
replacing the chip using a soldering iron. Try that on a DIMM!
2009 Oct 13
2
splitting dataframe, assign to new dataframe, add new rows to new dataframe
Hi, all,
My objective is to split a dataframe named "cmbine" according to the value of "classes". After the split, I will take the first instance from each class and bin them into a new dataframe, "df1". In the 2nd iteration, I will take the 2nd available instance and bin them into another new dataframe, "df2".
>cmbine$names
apple tiger pencil chicken
2007 Feb 22
2
Combining tapply() and cor.test()?
Hello, fellow R-users.
Let me describe the setup first. I have a data.frame, a sample of
which is reported below:
Company.Name Periods Returns MFR.Factor
350 Wartsila Oyj A 1996-07-31 6.82 0.02
351 Custodia Holding AG 1996-07-31 4.15 -0.02
352 Wartsila Oyj 1996-07-31 7.73 0.09
353 GEA Group AG
2014 Mar 12
0
[PATCH RFC v6 09/11] pvqspinlock, x86: Add qspinlock para-virtualization support
This patch adds para-virtualization support to the queue spinlock in
the same way as was done in the PV ticket lock code. In essence, the
lock waiters will spin for a specified number of times (QSPIN_THRESHOLD
= 2^14) and then halted itself. The queue head waiter will spins
2*QSPIN_THRESHOLD times before halting itself. When it has spinned
QSPIN_THRESHOLD times, the queue head will assume that the
2011 Sep 27
0
Platinum Blu-Ray Defeat the World
I ordered the Limited Edition Diamond Collector's Set,because I'm a big Disney dvd (http://www.seriesonsale.com/DVDs/Walt-Disney-s-100-Years-Of-Magic-164-Discs-DVD-Box-Set-24.html)fan. I was blown away by how nice the set really is. The box is lined in velvet with gold embossments. The lithographs are of pencil animation, so you get to see all of the animator's original pencil lines.