Displaying 20 results from an estimated 10000 matches similar to: "Calculate the difference between dates"
2008 May 12
1
help with calculating the differences between dates
Dear list,
How can I calculate the difference in days between the eventdate and basedate in the below dataset?
id basedate outcome.3 eventdate daydiff
1 1001 1999-09-28 2 1999-10-01 3
2 1002 1999-09-22 1
3 1003 2000-01-19 1
4 1004 2004-01-25 2 2004-02-03 9
5 1005 2005-08-11 1
6 1006 2000-07-04
2007 Aug 02
4
problem with reading data files with different numbers of lines to skips
Dear List,
I have 30 data files with different numbers of lines (31 and 33) that I want to skip before reading the files. If I use the skip option I can only choose either to skip 31 or 33 lines. The data files with 31 lines have no blank rows between the lines and the header row. How can I read the files without manually checking which files have 31 respectively 33 lines ? The only text
2008 Feb 08
2
correlation
Dear list
I would like to compare two measurements of disease severity (M1 and
M2), one of the is continuous (M1 ranging from 1 to 10) and the other
is ordinal (M2 takes Low, Medium, high and very high). Do you think is
ok to use cor() function to test whether the two agree, i.e correlate?
I am afraid that if I set M2 to 1,2,3 and 4, the function cor() will
take them as continuous and
2008 Jan 28
1
help with checking out-of-range values in each column in data frame
Dear list,
I have following data, where I want to check if any value in each
column is out of range. For example, column "f1" can only take values
1-5, so if any values less than 1 or > 5 will be
defined as missing value (i.e. NA), column "f4" can only take values
of 1-3 and any values that are outside this interval will be
considered as missing values. The below
2013 Jun 14
2
significance testing for the difference in the ratio of means
I have a question regarding significance testing for the difference in the
ratio of means.
The data consists of a control and a test group, each with and without
treatment. I am interested in testing if the treatment has a significantly
different effect (say, in terms of fold-activation) on the test group
compared to the control.
The form of the data with arbitrary n and not assuming equal
2009 Mar 05
1
is there any option like cex.axis in ggplot2?
Dear list,
I made boxplots using ggplot and want to control for x- and yaxis. Using "plot" I can do it by setting cex.axis equally to any size but can't figure out how to do it with ggplot.
ggplot(dat, aes(x = factor(time), y = volume)) + opts(axis.title.x=theme_text(size=8),axis.title.y=theme_text(size=8)) +
geom_boxplot() + geom_jitter(aes(colour = id))+labs(x =
2008 Feb 12
3
help with bwplot
Dear list,
I have following data set, which I want to plot the "Scale" variable on the
x-axis and "Mean"´on the y-axis for each Ageclass and for each sex. The Mean
value of each Ageclass for each sex would be connected by a line. Totally,
there should be 6 lines, from which three present the Mean values of each
Ageclass for respective sex. Are there any easy ways to do
2008 Apr 01
1
set the lower bound of normal distribution to 0 ?
Tom Cohen <tom.cohen78@yahoo.se> skrev: Thanks Prof Brian for your suggestion.
I should know that for right-skewed data,
one should generate the samples from a lognormal.
My problem is that x and y are two instruments that were thought to
be measured the same thing but somehow show a wide confidence interval
of the difference between the two intruments.This may be true that
these
2013 Apr 23
1
Writing contrast statements to test difference of slope in linear regressions
Hi Everyone,
I am uncertain that I am writing the contrast statements correctly. Basically, I'm unsure when to use a -1 and a 1 when writing the contrasts. Specifically I am interested in comparing the slopes between different temperature regimes. Temperature is therefore a factor. Time and percent are numerical. Using the gmodels package I made the following model:
2006 Mar 13
3
hfsc and dropped packets
Hi,
I''m trying to get a handle on hfsc. Here is my configuration:
root@jmnrouter:/jmn# tc class show dev vlan1
class hfsc 1: root
class hfsc 1:1 parent 1: ls m1 0bit d 0us m2 225000bit ul m1 0bit d 0us m2
225000bit
class hfsc 1:10 parent 1:1 rt m1 191000bit d 25.0ms m2 135000bit ls m1 0bit
d 0us m2 135000bit ul m1 0bit d 0us m2 225000bit
class hfsc 1:20 parent 1:1 rt m1 22008bit d
2008 Oct 23
0
error when using logistic.display within a loop
Dear list,
I tried to apply the logistic regression to different response variables from a dataframe and would like to store the results using the function logistic.display from the "epicalc" package in a list, but got an error message "Error in eval(expr, envir, enclos) : y values must be 0 <= y <= 1". All the response variables have value of 0 or 1. It worked
2010 Jun 16
2
data frame
Dear list,
I have the following problem. I have a data frame like this
CLUSTER YEAR variable Delta R_pivot
M1 2005 EC01 NA NA
M1 2006 EC01 2 NA
M1 2007 EC01 4 5
M2 2005
2010 Jun 17
1
big big problem
Dear list,
I'll try to be more clear in explaining my problem. I have a data frame like this called X:
CLUSTER YEAR variable value1 value2
M1 2005 EC01 NA NA
M1 2006 EC01 2 5
M1 2007
2009 Aug 18
1
create a table in the console!!
HI
I want to do a table with R (in the console)
GWP_Max NumberOfPolicies
No_GWPMax 8
[0-1000] 4
[1000-3000] 3
[> 3000] 5
i begin by calculate the number of policies in each class :
Data1 <- read.csv2("c:/Total1.csv", sep=",")
> Data2 <- read.csv2("c:/GWPMax1.csv",sep=",")[1:20,1:2]
> M <- merge(Data1,Data2, by.x =
2004 Jul 13
1
MLE, precision
Hi, everyone
I am trying to estimate 3 parameters for my survival
function. It's very complicated. The negative
loglikelihood function is:
l<- function(m1,m2,b) -sum( d*( log(m1) + log(m2)
+ log(1- exp(-(b + m2)*t)) ) + (m1/b - d)*log(m2 +
b*exp(-(b + m2)*t) ) + m1*t - m1/b*log(b+m2) )
here d and t are given, "sum" means sum over these
two vairables.
the parameters
2009 Aug 18
1
Tr : create a table in the console!!
----- Message transféré ----
De : Inchallah Yarab <inchallahyarab@yahoo.fr>
À : r-help@r-project.org
Envoyé le : Mardi, 18 Août 2009, 16h26mn 20s
Objet : create a table in the console!!
HI
I want to do a table with R (in the console)
GWP_Max NumberOfPolicies
No_GWPMax 8
[0-1000] 4
[1000-3000] 3
[> 3000] 5
i begin by calculate the number of policies in each class :
Data1 <-
2010 May 14
1
Replacing double loop by apply
Dear R-users,
after trying and searching a long time i have the following question.
is it possible to replace to following double loop by some apply calls?
#######################################################################
m1 <- data.frame(v1=factor(letters[1:5]),
v2=factor(letters[2:6]),
v3=factor(letters[3:7]))
m2 <-
2013 Jun 27
2
[LLVMdev] Problem with linking modules which use a shared type
Hi,
I stumbled upon a strange thing regarding types and module linking, which I don't quite get, so maybe someone around here can enlighten me.
Consider the following code, which will create 2 modules m1 and m2, and a named structured type %T = { i32 }; m1 contains only a function definition f(%T), m2 contains a function declaration f(%T) and a function definition h(%T), where h will call f
2010 Apr 14
1
envelope in spatstat
Hi R users,
This query is regarding the use of the 'envelope' function in Spatstat.
My data can be represented as a point process with CONTINUOUS marks:
points <- ppp(x=x,y=y, marks=m, window= wind)
However the marks are alignments (lines), and so have to be treated
differently to normal scalar marks. Hence to create a mcf object with the
appropriate test function for alignment
2004 May 27
2
block diagonal matrix function
Hello List
I have just written a little function that takes two matrices as
arguments and returns a large matrix that is composed of the two input
matrices in upper-left position and lower-right position with a padding
value everywhere else. (function definition and toy example below). I
need nonsquare matrices and rowname() and colname() inherited appropriately.
Two questions:
(1) Is there a