Displaying 20 results from an estimated 20000 matches similar to: "svy equivalent of pairwise.t.test"
2013 Feb 11
1
Simple frequencies using svy design
Hello,
excuse me if this is trivial. I have some survey data with the following
design
MyDesign<-(id=ident, weights=~fwgt, fcp=~nval1+nval2, data=hh_data1)
I would like to run simple frequency tables such as those provided by the
freq() function of rgrs to check the impact of the sampling design on my
Ns. Anyway I can do this? thanks, V
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2012 Nov 20
5
Using if
Dear R users,
As a new comer to R, I would like to create a new variable using if
statements but don't know how to do it. Basically, I have two variables
(EvHint and MinTex). I want to create a third variable called RiskTest.
In SPSS, my syntax would look like
Compute RiskTest=0.
if (EvHint=1 & MinTex=1) RiskTest=1.
Question: How do I do this with R?
My Data
EvHint<-c(0, 0, 0, 1,
2009 Oct 09
1
svy / weighted regression
Dear list,
I am trying to set up a propensity-weighted regression using the
survey package. Most of my population is sampled with a sampling
probability of one (that is, I have the full population). However, for
a subset of the data I have only a 50% sample of the full population.
In previous work on the data, I analyzed these data using SAS and
STATA. In those packages I used a propensity weight
2010 May 11
1
(svy)glm and weights question
Hi all,
I am running a set of logistic regressions, where we want to use some
weights, and I am not sure whether what I am doing is reasonable or
not.
The dependent variable is turnout in an election - i.e. survey
respondents were asked whether or not they voted. The percentage of
those who say they voted is much higher than the actual turnout,
probably due both to non-response bias and social
2013 Jan 09
1
weighted factor analysis
hello there,
I am trying to use a weight variable in a factor analysis but apparently
the factanal command does not have a weight option. Any way to this? Thanks
for your suggestions, V
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2012 Jun 28
1
SVY: variance inflation factor VIF with complex survey
Hello,
Seeking a way to get the variance inflation factor VIF for a model of regression in complex survey, I have understood that without this package (SURVEY) RGui VIF obtained as follows:
fit <- lm(mpg~disp+hp+wt+drat, data=mtcars)
vif(fit)
But I want to know if survey, Vif is obtained so
vif( svyglm(api00~ell+meals+mobility, design=dstrat))
Thank you, happy day
2011 Jan 30
0
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2008 Apr 04
2
pairwise.t.test for paired data
Dear R-help, I have a question about pairwise.t.test and adjustment for
multiple comparisons for paired data points.
I have the following data:
n=c("x", "x", "x", "x", "x", "x", "x", "x", "x", "x", "y", "y",
"y", "y", "y", "y",
2012 Jun 10
1
V-Cramer in svy
Hello forum,
I want to find in survey how to test V-cramer and coefficient Goodman-Kruskal gamma, to test the collinearity between varibles to enter a model.
For the V-Cramer function is used with the package vcd assocstats but without considering the survey package.
I appreciate the cooperation.
Att. Diana Martinez
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2010 Sep 10
2
pairwise.t.test vs t.test
Dear all, I am perplexed when trying to get the same results using pairwise.t.test and t.test.
I'm using examples in the ISwR library,
>attach(red.cell.folate)
I can get the same result for pairwise.t.test and t.test when I set the variances to be non-equal, but not when they are assumed to be equal. Can anyone explain the differences, or what I'm doing wrong?
Here's an example
2009 Oct 27
1
Output pairwise.t.test to data.frame
# I'm doing a pairwise.t.test on a large dataset and need the output in a
data frame so I can work further with it, e.g. so I can export it to a
spreadsheet. Is there any way to coerce the results to an exportable format?
# For example, if I do:
test <- pairwise.t.test(numbers, factors, p.adj="bonferroni")
# and then
write.table(test, file="output.csv",
2006 Jun 15
1
individual scales in random subset of pairwise distance survey
Hello,
I'm curious if anyone has encounted a version of this
problem
(and it's solution) involving finding a consistent set
of scales
for subsets of survey data.
The goal is to obtain peoples' rankings of pairwise
similarity of a large
number of items, on a 1..5 scale for example, and
average these
across people to use as input to MDS:
How similar is object A to B on a 1..5
2006 May 02
1
pairwise.t.test: empty p-table
Hi list-members
can anybody tell me why
> pairwise.t.test(val, fac)
produces an empty p-table. As shown below:
Pairwise comparisons using t tests with pooled SD
data: val and fac
AS AT Fhh Fm Fmk Fmu GBS Gf HFS Hn jAL Kol R_Fill
AT - - - - - - - - - - - - -
Fhh - - - - - - - - - - - - -
Fm - - - - - - -
2009 Jun 12
1
Please Help pairwise.t.test!!
Hi R users,
My question is, If I have 3 groups, A, B, C and I know mean of A =20, B=21,
and C=20.5 and I also know the
standard error of A =1.1, B=2.2, C=3.2. Plus, I know A has 30 observations,
B has 78, C has 45. But I do not have the raw data.
Can I use pairwise.t.test to conduct a Bonferroni test? If yes, Could you
give me a hint?
Thank you so much
Chunhao
--
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2010 Sep 10
1
A couple of typos in ?pairwise.t.test
Hi all,
After my reply on R-Help to the relevant thread, I noted what appear to be a couple of typos in the Details section of ?pairwise.t.test. Note text with '**'.
Current text:
The **pool.SD** switch calculates a common SD for all groups and **used** that for all comparisons (this can be useful if some groups are small). This method does not actually call t.test, so extra arguments
2005 Aug 08
2
extract t-values from pairwise.t.test
Hi,
how can I extract the t-values after running a pairwise.t.test? The
output just list the p-values.
Many thanks for your help.
Cheers
Guido
____________________________________
Guido J. Parra
School of Tropical Environment Studies and Geography
James Cook University
Townsville
Queensland 4811
Phone: 61 7 47815824
Fax: 61 7 47814020
Mobile: 0437630843
e-mail:
2006 Sep 07
3
pairwise.t.test vs. t. test
Hi,
If I set the p.adjust="none", does it meant that the output p values from the pairwise.t.test will be the same as those from individual t.tests (set var.equal=T, alternative="t")?
I actually got different p values from the two tests. See below. Is it supposed to be this way?
Thanks
Johnny
> x
[1] 61.6 52.7 61.3 65.2 62.8 63.7 64.8 58.7 44.9 57.0 64.3 55.1 50.0 41.0
2010 Mar 25
1
Expected pairwise.student.t and TukeyHSD behavior?
pairwise.t.test is returning NAs when one of the samples only has one entry, while TukeyHSD returns results (maybe not trustworthy or believable, but results).
I stumbled on this because I did not realize one of my samples only had one entry while most of the others had several hundred, so I realize this is not a desirable situation. I'm really just curious about the difference between how
2012 Nov 23
1
Joining two files
Hello all,
I al trying to join (ADD FILES in SPSS) two files using the rbind()
function. However, with rbind() R does not behave the same way as SPSS. I
mean, it just concatenates the two blocs with no consideration for same
variables if these are not in the same position in the two files. Anyone
knows a function that performs the SPSS ADD FILES task? Thanks, V
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2004 Aug 18
6
paired t-test vs pairwise t-test
What's the difference between t.test(x, y) and pairwise.t.test()? Is it just
that the former takes two vectors, whereas the latter takes a vector and a
factor?