Displaying 20 results from an estimated 2000 matches similar to: "Conditional sampling"
2011 Feb 17
0
Data frame sampling
R users,
I have been trying to write a program in R that will extract rows from a data frame and combine the rows
into a new smaller data frame while meeting several criteria. I would greatly appreciate any advice
that could help me get started down the right path. What I want to do is to extract two rows WEEK
(26 weeks total) from the data frame by sampling without replacement from the
2011 Mar 09
2
Complex sampling?
R users,
I am trying to generate a randomized weekday survey schedule that ensures even coverage of weekdays in
the sample, where the distribution of variable DOW is random with respect to WEEK. To accomplish this I need
to randomly sample without replacement two weekdays per week for each of 27 weeks (only 5 are shown). However,
I need to sample from a sequence (3:7) that needs to be
2011 Jul 01
2
Initiating in BNArray
Hi,
I'm trying to understand some details about an example maintened in [1].
According that link, I have total.data as a data set (am I right?).
But I don't understand how is built that table.
I saved the dataset in a file, with dput(), and had something like this:
structure(list(df.all = structure(list(V1 = structure(c(1L, 2L,
3L, 4L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L, 13L, 14L, 15L,
2010 Apr 19
1
What is mclust up to? Different clusters found if x and y interchanged
Hello All...
I gave a task to my students that involved using mclust to look for clusters
in some bivariate data of isotopes vs various mining locations. They
discovered something I didn?t expect; the data (called tur) is appended
below.
p <- qplot(x = dD, y = dCu65, data = tur, color = mine)
print(p) # simple bivariate plot of the data; looks fine
mod1 <- Mclust(tur[,2:3])
mod1$G
mod2
2008 Jul 31
2
sort rows of matrix by rows of another matrix
Hello all,
I am trying to sort rows of one matrix by rows of another. Given a1 and a2:
------
> a1
[,1] [,2] [,3]
[1,] 7 6 8
[2,] 4 2 4
[3,] 4 7 2
[4,] 0 3 8
a1 <-
structure(c(7, 4, 4, 0, 6, 2, 7, 3, 8, 4, 2, 8), .Dim = c(4L, 3L))
> a2
[,1] [,2] [,3]
[1,] 101 102 103
[2,] 101 102 103
[3,] 101 102 103
[4,] 101 102 103
a2 <-
2011 Jul 07
2
How do I overlay two trellis plots of lme fitted lines produced by plot.augPred?
Hello,
I want to use lme to fit two (or more) models, and then compare the fits
on each individual. I know how to write my own code to do this (for each
individual, plot the raw data, followed by lines() to plot each fitted
curve) but I would like to use plot(augPred(... as it produces a nice
trellis plot. I thought I could do this with par(new=T) but it does not
seem to work.
2008 Sep 26
2
Date Time conversion
what am I doing wrong?
chron(as.character(f), format=c(dates="%m/%d/%y", times="%h:%m"))
f <- structure(c(51L, 60L, 66L, 87L, 90L, 115L, 23L, 35L, 37L, 6L,
12L, 55L, 84L, 96L, 109L, 17L, 29L, 41L, 3L, 74L, 94L, 102L,
30L, 8L, 46L, 69L, 107L, 15L, 25L, 39L, 1L, 71L, 95L, 19L, 56L,
62L, 76L, 85L, 99L, 111L, 42L, 4L, 52L, 61L, 67L, 91L, 13L, 24L,
36L, 38L, 7L, 81L, 82L, 57L,
2010 Mar 05
2
How to assign week numbers to a time-series
Hello everyone,
My progress has stalled on finding a way of creating a somewhat complicated variable to add to my existing dataframe and I am hoping one of you could help me out. The dataframe below contains only a fraction of the data of my complete dataframe, but all of the variables. What I want to do is add another variable named 'WEEK' to this dataframe that is assigned 1 for row 1
2016 Apr 22
1
Unique Ordering
Hi R-Help,
data at bottom
I've been struggling with a problem where I need to order based on 1) the
Frequency "Freq" and 2) keeping each group of 3 of the same type together
"Var2" but I want across all groups it to go "high to low" based on the
earn factor.
Thank you!
structure(list(Var1 = structure(c(1L, 3L, 2L, 1L, 2L, 3L, 1L,
3L, 2L, 3L, 1L, 2L, 3L, 1L,
2009 Aug 07
1
ggplot2-ddply question
Hi all:
I am trying to use the ddply function to estimate the mean of 'Total','Fry','Smolt' and 'Fry.Eq' columns without success. I have the dput of my dataset below. I wonder if someone can give me a hand with this function.
# dput(winter)
winter <-structure(list(IDDate = structure(c(37L, 48L, 59L, 62L, 63L,
64L, 65L, 66L, 67L, 38L, 39L, 40L, 41L, 42L, 43L,
2013 Feb 27
2
matrix multiplication
Hi,
Try this:
#mat1 is the data
res<-do.call(cbind,lapply(seq_len(nrow(mat1)),function(i) {new1<-do.call(rbind,lapply(seq_len(nrow(mat1[-i,])),function(j) {x1<-rbind(mat1[i,],mat1[j,]); x2<-(abs(x1[1,1]-x1[2,1])*abs(x1[1,5]-x1[2,5]))+(abs(x1[1,2]-x1[2,2])*abs(x1[1,6]-x1[2,6]))+(abs(x1[1,3]-x1[2,3])*abs(x1[1,7]-x1[2,7]))+(abs(x1[1,4]-x1[2,4])*abs(x1[1,8]-x1[2,8]))}));new1}))
2013 Apr 11
1
Dotchart per groups
Hi all,
I would like to ask you for help. I did a dotplot - using dotchart
function.
There are two localites (loc) with values 75 or 56 in my data ZZ.
The f column has 4 levels: P1, S1, S8, R6.
The dataframe is ordered by N value, pchloc value is assign to use "pch" in
plot.
> head(ZZ)
loc f N color ordered pchloc
98 75 S1 6.39 green 1 16
99 75 S8 6.44 blue
2011 Jan 19
1
Using subset to filter data table
I am having difficulty understanding how I would constrain a data set by
filtering out 'records' based on certain criteria.
Using SQL I could query using 'select * from my.data where LithClass in
('sand', 'clay')' or some such.
Using subset, there seem to be ghosts left behind (that is, all of the
LithClass *.Labels* remain after subset)
> dput(tcc)
2011 Nov 10
2
plotting a function with given formula in ggplot2
Hi All,
I have a scatter plot produced using ggplot2 and I want to add the
regression line to this scatter plot. I suppose I can use
geom_smooth() to do this, but for the sake of learning ( I am new both
to R and ggplot2), I want to try and add it as a function (something
that curve() does in the standard R plotting). I did some search and
found that stat_function() can be used for this. But
2011 Nov 08
2
nesting scale_manual caracteristics in ggplot
Hi there,
I am having a little problem with combining three scale_manual commands in a
facet plot. I am not able to combine the three different characteristics,
instead ending up with three different descriptions next to the graph for
the same geom. I would like to see two separate labels (not three); one
describing lines 1-7 and the other 8-14. For each of the treatments (A-B) I
want a
2010 Apr 20
5
Assigning Week Numbers
R experts,
How could I extract the week number from a date vector (in Date class)
such that week numbering (week 1...2...) begins (May 01) and ends
(October 31) on the same specific dates each year? Week numbering
must conform to the following day numbering format (Sat=1,Sun=2,Mon=3.....Fri=7).
This means that new weeks must begin on Saturdays, and end on Fridays
(except for the first date
2018 May 16
1
Systemfit Question
I can't get my simultaneous equations to work using system fit. Please help.
#Reproducible script
Empdata<- read.csv("/Users/ngwinuiazenui/Documents/UPLOADemp.csv")
View(Empdata)
str(Empdata)
Empdata$gnipc<-as.numeric(Empdata$gnipc)
install.packages("systemfit")
library("systemfit")
pdata <- plm.data(Empdata,
2017 Dec 06
2
Odd dates generated in Forecasts
Dear friends,
I have a weekly time series which starts on Jan 4th, 2003 and ends on
december 31st, 2016.
I set up my ts object as follows:
MyTseries <- ts(mydataset, start=2003, end=2016, frequency=52)
MyModel <- auto.arima(MyTseries, d=1, D=1)
MyModelForecast <- forecast (MyModel, h=12)
Since my last observation was on december 31st, 2016 I expected my forecast
date to start on
2017 Dec 06
0
Odd dates generated in Forecasts
> On Dec 6, 2017, at 5:07 AM, Paul Bernal <paulbernal07 at gmail.com> wrote:
>
> Dear friends,
>
> I have a weekly time series which starts on Jan 4th, 2003 and ends on
> december 31st, 2016.
>
> I set up my ts object as follows:
>
> MyTseries <- ts(mydataset, start=2003, end=2016, frequency=52)
>
> MyModel <- auto.arima(MyTseries, d=1, D=1)
2017 Dec 06
1
Odd dates generated in Forecasts
Thank you very much David. As a matter of fact, I solved it by doing the
following:
MyTimeSeriesObj <- ts(MyData, freq=365.25/7,
start=decimal_date(mdy("01-04-2003")))
After doing that adjustment, my forecasts dates started from 2017 on.
Cheers,
Paul
2017-12-06 12:03 GMT-05:00 David Winsemius <dwinsemius at comcast.net>:
>
> > On Dec 6, 2017, at 5:07 AM, Paul