Displaying 20 results from an estimated 178 matches for "jsorkin".
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sorkin
2006 May 12
4
Title of page with multiple plots
...statistics and Informatics
Baltimore VA Medical Center GRECC and
University of Maryland School of Medicine Claude Pepper OAIC
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
410-605-7119
jsorkin at grecc.umaryland.edu
2005 Jul 28
4
CSV file and date. Dates are read as factors!
...Baltimore VA Medical Center GRECC and
University of Maryland School of Medicine Claude Pepper OAIC
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
410-605-7119
- NOTE NEW EMAIL ADDRESS:
jsorkin at grecc.umaryland.edu
2005 Oct 11
2
Two factor (or more) non-parametric comparison of means
...ltimore VA Medical Center GRECC and
University of Maryland School of Medicine Claude Pepper OAIC
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
410-605-7119
- NOTE NEW EMAIL ADDRESS:
jsorkin@grecc.umaryland.edu
[[alternative HTML version deleted]]
2010 Dec 28
4
Reading sas7bdat files into R
Hi All,
I am trying to import a .sas7bdat file into R.
I tried using Hmisc package's sasxport.get() function.
temp <- sasxport.get("path\abcd.sas7bdat")
I get an error that says "Error in lookup.xport(file) : file not in SAS transfer format"
I am not familiar with SAS transfer format.
Could somebody please clarify what is it that I am missing,
Thanks for your
2011 Mar 19
3
Generating repeated measures data
...f a repeated measures ANOVA given a known (1) within-person correlation with known (2) mean and SD of data obtained at each of three times of observation?
Thanks,
John
John Sorkin
Chief Biostatistics and Informatics
Univ. of Maryland School of Medicine
Division of Gerontology and Geriatric Medicine
JSorkin at grecc.umaryland.edu
Confidentiality Statement:
This email message, including any attachments, is for th...{{dropped:6}}
2005 Jul 29
6
Binary outcome with non-absorbing outcome state
...ltimore VA Medical Center GRECC and
University of Maryland School of Medicine Claude Pepper OAIC
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
410-605-7119
- NOTE NEW EMAIL ADDRESS:
jsorkin@grecc.umaryland.edu
[[alternative HTML version deleted]]
2007 Jan 18
3
selecting rows for inclusion in lm
...nit, and
Baltimore VA Center Stroke of Excellence
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
jsorkin at grecc.umaryland.edu
Confidentiality Statement:
This email message, including any attachments, is for the so...{{dropped}}
2008 Mar 02
3
emacs and R
...nit, and
Baltimore VA Center Stroke of Excellence
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
jsorkin at grecc.umaryland.edu
Confidentiality Statement:
This email message, including any attachments, is for th...{{dropped:6}}
2007 Mar 26
4
Problem dropping rows based on values in a column
...nit, and
Baltimore VA Center Stroke of Excellence
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
jsorkin at grecc.umaryland.edu
Confidentiality Statement:
This email message, including any attachments, is for the so...{{dropped}}
2006 Nov 21
2
sample size for linear regression
...nit, and
Baltimore VA Center Stroke of Excellence
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
jsorkin at grecc.umaryland.edu
Confidentiality Statement:
This email message, including any attachments, is for the so...{{dropped}}
2008 Oct 16
1
apply, t-test and p-values
...nit, and
Baltimore VA Center Stroke of Excellence
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
jsorkin at grecc.umaryland.edu
Confidentiality Statement:
This email message, including any attachments, is for th...{{dropped:6}}
2005 Jul 15
3
Dividing a vector into ntiles
...ltimore VA Medical Center GRECC and
University of Maryland School of Medicine Claude Pepper OAIC
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
410-605-7119
- NOTE NEW EMAIL ADDRESS:
jsorkin@grecc.umaryland.edu
[[alternative HTML version deleted]]
2006 Jul 03
6
macro facility in R
...Claude D. Pepper OAIC,
University of Maryland Clinical Nutrition Research Unit, and
Baltimore VA Center Stroke of Excellence
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
410-605-7119
jsorkin at grecc.umaryland.edu
2016 Apr 07
0
using apply to a data frame
??I would like to apply a function, fract, to the columns of a
dataframe. I tried the following
apply(data5NonEventEpochs,2,fract)
but, no surprise it did not work as apply works on matrices not data
frames. How can I apply a fuction to the columns of a data frame? (I
can't covert data5NonEventsEpochs to a matrix as it contains character
data).
Thank you,
John
John David Sorkin M.D., Ph.D.
2007 Mar 06
5
Recalling and printing multiple graphs. Is there something in the HISTORY menu that will help?
...nit, and
Baltimore VA Center Stroke of Excellence
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
jsorkin@grecc.umaryland.edu
Confidentiality Statement:
This email message, including any attachments, is for the so...{{dropped}}
2006 Oct 14
2
regression analyses using a vector of means and a variance-covariance matrix
...nit, and
Baltimore VA Center Stroke of Excellence
University of Maryland School of Medicine
Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
jsorkin at grecc.umaryland.edu
Confidentiality Statement:
This email message, including any attachments, is for the so...{{dropped}}
2009 Dec 08
2
lm: RME vs. ML
windows XP
R 2.10
As pointed out by Prof. Venables and Ripley (MASS 4th edition, p275), the results obtained from lme using method="ML" and method="REML" are often different, especially for small datasets. Is there any way to determine which method is preferable for a given set of data?
Thanks,
john
John David Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
2006 Dec 09
7
Simulation with R
An apparatus exists whereby a collection of balls is displaced to the
top of a stack by suction. A top level (Level 1) each ball is shifted
1 unit to the left or 1 unit to the right at random with equal
probability. The ball then drops down to level 2. At Level 2, each
ball is again shifted 1 unit to the left or 1 unit to the right at
random. The process continues for 15 levels and the balls are
2007 Oct 01
4
data structure with coefficients, and call from lm()
Widows XP
R 2.3.1
I have been trying to make a data structure that will contain both the coefficients from a linear regression along with column and row titles AND the call, i.e.
myreg<-lm(y~x+y+z)
whatIwant<-cbind(c(summary(myreg)$call,"",""),summary(myreg)$coefficients)
Neither the statement above, nor any one of twenty variations I have tried work. I would appreciate
2011 Jan 04
5
Page eject and clearing the console
(1) I know that \n when used in cat, e.g. cat("\n") produces a line feed (i.e. skips to the next line). Is there any escape sequence that will go to the top of the next page?
(2) I know that control L will clear the console. Is there an equivalent function or other means that can be used in R code to clear the console?
Thanks,
John
John David Sorkin M.D., Ph.D.
Chief, Biostatistics