Displaying 20 results from an estimated 700 matches similar to: "How to get the SS and MS from oneway.test?"
2010 Mar 09
3
Help with ANOVA in R
Hi
I am attempting Anova analysis to compare results from four groups
(Samp1-4) which are lists of intensities from the experiment. I am
doing this by first creating a structured list of the data and then
conducting the ANOVA (Script provided below). Im an R beginner so am
not sure if I am using this correctly. Two major questions I have are:
1)
Is using the code (zzz.aov <- aov(Intensity ~
2010 Apr 29
1
How to estimate the residual SD for each sample separately in mixed-effects model?
Dear R-helpers,
I am developing a Mixed-Effects model for a study of immunoassays using
'lme4' library. The study design is as follows: 10 samples were run
using 7 different immunoassays, 3 times each, in duplicates. Data
attached. I have developed the following model:
c.lme <- lmer(Result~SPL + (SPL|Assay/Run) -1, data=data)
This model has excellent predictions - the Rsquared of
2006 Mar 29
1
Oneway Audio
Hi all,
I did not get this error in Asterisk 1.2.5 release. I am testing on Asterisk
SVN-trunk-r15187 to avail the PARKEDAT variable.
- I park the call using ParkAndAnnounce
- plays moh.
- accept the call using ParkedCall
The following errors are coming on the console and there is oneway audio -
no audio after Music-On-Hold at caller's side. Please advice.
I am testing using cisco 7902
2006 Jun 21
1
eliminating a do loop
Using a "by() statement, I am preparing ANOVA's for multiple experiments,
and using simint() to generate confidence intervals.
This works fine.
simint.by.fit <- by(analytes.dfr, list(Assay = analytes.dfr$analyte ),
function(data) (simint(value ~ tx, data = data,type='Tukey' ) ) )
I can separately prepare plots of the confidence intervals, and I can
prepare separate plots
2012 Jan 22
1
How to construct a formula
Hi,
I need to construct a formula programaticly, and pass it to a function
such as the linear mixed model lme. The help says it requires "a
two-sided linear formula object describing the fixed-effects part of the
model" but I do not know how to create this formula. I have tried
various things using formula(x, ...), as.formula(object, env =
parent.frame()) and as.Formula(x, ...)
2011 Apr 21
1
one-way ANOVA model, with one factor, an unbalanced design and unequal variances
Hi,
i'm looking for an R function to fit a one-way ANOVA with one factor
containing 10 levels. The factor levels have different numbers of
observations (varying between 20 to 40). For most of the dependent variables
i'm testing there are unequal variances among the factor levels.
I see the function oneway.test:
oneway.test(variable ~ factor, data=dataset)
which by default does not
2018 Jan 16
1
Letters group Games-Howell post hoc in R
Hello everybody,
I use the sweetpotato database included in R package:
data(sweetpotato) This dataset contains two variables: yield(continous
variable) and virus(factor variable).
Due to Levene test is significant I cannot assume homogeneity of variances
and I apply Welch test in R instead of one-way ANOVA followed by Tukey
posthoc.
Nevertheless, the problems come from when I apply posthoc
2003 May 12
1
update.lme trouble (PR#2985)
Try this
data(Assay)
as1 <- lme(logDens~sample*dilut, data=Assay,
random=pdBlocked(list(
pdIdent(~1),
pdIdent(~sample-1),
pdIdent(~dilut-1))))
update(as1,random=pdCompSymm(~sample-1))
update(as1,random=pdCompSymm(~sample-1))
update(as1,random=pdCompSymm(~sample-1))
update(as1,random=pdCompSymm(~sample-1))
I'm
2008 Feb 09
2
oneway audio with asterisk behind cisco pix 506
Hi,
I have the Cisco PIX 506 firewall right in front of the asterisk and I am
getting a one-way audio. I need your help/guidance to resolve this problem.
I have the "fixups" disabled for SIP in the Cisco PIX 506. Any help
rendered by you in this subject is greatly appreciated. I have been breaking
my head trying to resolve this problem for more than one month. I have
included the
2010 Dec 13
1
Multivariate binary response analysis
Greetings ~
I need some assistance determining an appropriate approach to analyzing multivariate binary response data, and how to do it in R.
The setting: Data from an assay, wherein 6-hours-post-fertilization zebrafish embryos (n=20, say) are exposed in a vial to a chemical (replicated 3 times, say), and 5 days later observed for the presence/absence (1/0) of defects in several organ systems
2012 Nov 29
2
Analysis of Variance
Hi, I am encountering a difficulty I don't understand. Be patient, I'm very
new to analysis of variance.
If I load this data:
example12_7=read.table("http://msemac.redwoods.edu/~darnold/math15/data/chapter12/example12_7.dat",header=TRUE)
The run the oneway.test:
oneway.test(time~drug,data=example12_7,var.equal=TRUE)
I get these results:
data: time and drug
F = 4.1881, num
2004 Nov 22
1
Left justification af dimnames in tables.
Hi helpeRs.
When I do two-ways tables dimnames in columns are almost left-adjusted:
<- factor(rbinom(30,1,.3),labels=c("first","second"))
> b <- a
> table(a,b)
b
a first second
first 21 0
second 0 9
If I do a oneway table however, dimnames are right-adjusted:
table(a)
a
first second
21 9
Actually I must admit I
2007 Jan 09
5
a question of substitute
Hi all,
I want to write a wrapper for an analysis of variance and I face a curious
problem. Here are two different wrappers:
fun.1 <- function(formula) {
summary(aov(formula))
}
fun.2 <- function(formula) {
oneway.test(formula)
}
values <- c(15, 8, 17, 7, 26, 12, 8, 11, 16, 9, 16,
24, 20, 19, 9, 17, 11, 8, 15, 6, 14)
group <- rep(1:3, each=7)
# While the first
2008 Dec 07
2
concordance correlation coefficient using R
Hi.
I have data which i would want to assess the degree of agreement
between two assays, e.g., to evaluate reproducibility or for
inter-rater reliability. I have used the Pearson product-moment
correlation coefficient. It looks good ranginging between 0.90 to
0.998. Though this looks good. I am told the Concordance correlation
coefficient will give a better picture of how reproducible the assay
2008 Mar 15
1
Anova
Hi all,
I apologize for what might be a silly question.
I am interested in doing a one way anova.
This is not too hard in and of itself, either with anova, aov or oneway.test
.
However, I need to
1) get pvalues,
2) do a posthoc analysis with Tukey HSD,
3) and have (sometimes) an unbalanced design.
I just can't seem to put all the pieces together.
Any suggestions?
Thanks in advance,
Dan.
2009 Jul 09
2
plm Issues
Hi List
I'm having difficulty understanding how plm should work with dynamic
formulas. See the commands and output below on a standard data set. Notice
that the first summary(plm(...)) call returns the same result as the second
(it shouldn't if it actually uses the lagged variable requested). The third
call results in error (trying to use diff'ed variable in regression)
Other info:
2010 Oct 13
5
Regular expression to find value between brackets
Hi,
this should be an easy one, but I can't figure it out.
I have a vector of tests, with their units between brackets (if they have
units).
eg tests <- c("pH", "Assay (%)", "Impurity A(%)", "content (mg/ml)")
Now I would like to hava a function where I use a test as input, and which
returns the units
like:
f <- function (x) sub("\\)",
2017 Aug 08
1
Bug?
Hello,
In my code I found something that looks like an anomaly, I found a reproducible example in which I am just trying to compare each row in a data frame against the first row:
a<-data.frame(row=c("B","C","B"),column=c(2,2,10),assay=c("Assay1","Assay1","Assay1"),plate=c(1,1,1),stringsAsFactors=FALSE)
apply(a[1:2,],1,function(x) {
2012 Jun 14
1
Can someone recommend a package for SNP cluster analysis of Fluidigm microarrays?
I know that there are quite a few packages out that there for cluster
analysis. The problem that I am facing is finding a package that will not
incorporate all my samples into clusters but just the samples that fit a
threshold (that I have not set yet and may need help finding the right
level) for genotyping. It should be able to "no call" samples outside the
clusters. It also needs to
2004 Mar 15
2
imputation of sub-threshold values
Is there a good way in R to impute values which exist,
but are less than the detection level for an assay?
Thanks,
Jonathan Williams
OPTIMA
Radcliffe Infirmary
Woodstock Road
OXFORD OX2 6HE
Tel +1865 (2)24356