Displaying 20 results from an estimated 7000 matches similar to: "ANOVA/aov question"
2005 Jul 23
1
Non-linear "linear" models?
Hi,
I'm new to R (though I have spent hours trying to learn how to use
it) and also not very knowledgeable
about statistics, so I hope you will excuse what may seem like a very
basic question. I'm trying to use
R to do an ANOVA analysis for some data with an unbalanced design, and
while I was trying to figure that out, I got confused about the purpose
of the "lm". All
2009 Dec 11
2
Looking for categorization method/module in R
All,
I'm relatively new to using R, having used it thus far for some simple
statistics and plotting. However, I'm not new to programming by any
measure.
I've been looking at the various modules available for clustering,
factor analysis, etc. and find that I need advice on which modules I
should be focusing on and their application.
I have a data set comprised of columns of both
2012 Sep 06
2
Generalized additive models: Plots for Qualitative Data
Hello,
My name is Dontrece Smith. I am creating figures for my GAMs. I change my
qualitative variables to 1 or 2 in my dataset, so I would be able to run my
GAMs. However, R will only display plots for my quantitative variables and
not my qualitative variables. Is there any way to fix this issue? I listed
some of my code below:
> library(mgcv)
This is mgcv 1.7-13. For overview type
2006 Jul 06
1
which data structure for a set of time series ?
Hello,
I'm a R newcomer and I'm wondering the kind of data structure that would
best fit to my problem:
my data are equities (stocks) : so I have a time serie (say 1 year of weekly
data), and a bunch of qualitative + quantitative variables :
the sector of the stock (biotech/finance...), the geographical region, the
name, ISIN code, P/E ratios, whatever...
The data.frame is perfect for the
2008 Nov 24
1
RQDA-0.1.5 is released
RDQA is a package for Qualitative Data Analysis built upon R. It works
both on the Windows and Linux/FreeBSD platforms. RQDA is an
easy-to-use tool to assist in the analysis of textual data. At the
present, it supports only plain text format data. All the information
is stored in SQLite database via the R package of RSQLite. The GUI is
based on RGtk2, via the aid of gWidgetsRGtk2. It includes a
2008 Nov 24
1
RQDA-0.1.5 is released
RDQA is a package for Qualitative Data Analysis built upon R. It works
both on the Windows and Linux/FreeBSD platforms. RQDA is an
easy-to-use tool to assist in the analysis of textual data. At the
present, it supports only plain text format data. All the information
is stored in SQLite database via the R package of RSQLite. The GUI is
based on RGtk2, via the aid of gWidgetsRGtk2. It includes a
2002 Nov 07
2
Qualitative factors
Hi,
I have some doubt about how qualitative factors are coded in R. For
instance, I consider a response y, a quantitative factor x and a qualitative
factor m at 3 levels, generated as follow :
y_c(6,4,2.3,5,3.5,4,1.,8.5,4.3,5.6,2.3,4.1,2.5,8.4,7.4)
x_c(3,1,3,1,2,1,4,5,1,3,4,2,5,4,3)
m_gl(3,5)
lm(y~x+m)
Coefficients:
(Intercept) x m2 m3
3.96364 0.09818
2002 Jun 30
1
simple ANOVA problem
Hello list members,
this is rather a simple question but I can't find the solution myself, so I
would appreciate your help and I apologise in advance for my ignorance.
I have a data frame with a header containing variable names and I have 4
independent variables and 5 dependent variables. It looks like this:
x1 x2 x3 x4 y1 y2 y3 y4 y5
1 1 33 55 4
2011 Jan 08
1
summary(list) is awesome, but I want more than summary
When I load a table from a data source and run summary() on it, the
summary gives me basic summary statistics I'm looking for, and it also
discriminates between quantitative and qualitative data and summarizes
them accordingly. For example, if I do this:
mydata <- read.table("data.txt")
summary(mydata)
I would get output like this:
> summary(mydata)
County
2023 Feb 21
1
MFA variables graph, filtered by separate.analyses
Hi!
Apologies if this is not the correct place to ask. I am attempting a
MFA analysis of a dataset based on wine chemical and sensory analysis,
based on the STHDA tutorial [1]. (I am using this dataset here too, as
an example dataset to work on without posting my actual data. I've
tried this with both my data and the example data, with the exact same
results.)
The only issue I am having is
2008 Jan 21
4
Stationarity of a Time Series
Does anyone know of a test for stationarity of a time series, or like
all ordination techniques it is a qualitative assessment of a
quantitative result. Books, papers, etc. suggestions welcome.
thanks
Stephen
--
Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods. We are
2009 Sep 02
1
a question for beginner
Hello,
i have this dataset http://www.umass.edu/statdata/statdata/data/pharynx.txt.
the variables GRADE, T_STAGE anda N_STAGE are qualitative or quantitative
variables???
i only have this simple doubt...!
another example: why in the dataset ovarian (library survival) the variable
ecog.ps: ECOG performance status (1 is better, see reference) it is
consider quantitative?
Thank's for
2008 Jan 18
3
Select a group of data from a file
Hello everybody!
I've a file with several data six variables, three quantitative and three qualitative, I would like to select a group of data from the file to analyze then, i.e:
my file is like that (but with 6 variables):
Var1 Var2
2 1
5 1
8 1
7 2
3 2
8 2
I want to use only the data where var2 is "1"
2 1
5 1
8 1
Exist a
2007 Aug 24
4
perception of graphical data
Hello,
I apologize that this is off-topic. I am seeking information on
perception of graphical data, in an effort to improve the plots I
produce. Would anyone point me to literature reviews in this area? (Or
keywords to try on google?) Is this located somewhere near cognitive
science, psychology, human factors research?
For example, some specific questions I have are:
I recall as a child
2012 May 15
1
Regression Analysis or Anova?
Dear all,
I hope to be the clearest I can.
Let's say I have a dataset with 10 variables, where 4 of them represent for
me a certain phenomenon that I call Y.
The other 6 represent for me another phenomenon that I call X.
Each one of those variables (10) contains 37 units. Those units are just
the respondents of my analysis (a survey).
Since all the questions are based on a Likert scale, they
2012 May 29
3
PROBLEMS with In `[<-.factor`(`*tmp*`, (¿ORDERED FACTOR?)
HI!!!
I have a table containing qualitative and quantitative data; one of the
columns contains "Level of education", and the possibilities are "none",
"High school", "college"; I want to give the value 0 to "none", the value 1
to "High school", and 2 to "college", but I got the following error:
In `[<-.factor`(`*tmp*`,
2002 May 28
2
logit regression, test among groups
Dear all:
My logistic regression model includes one qualitative and one quantitative
predictor variable,
aes <- glm(p.a ~ spp * log(light), family=binomial(link=logit)),
where spp is abundance of 3 species and light is subcanopy light
availability varying from 0 1.
I want to test differences among levels of the quantitative variable at a
value of x other than the current log(light)=0.
2008 May 27
1
lm() output with quantiative predictors not the same as SAS
I am trying to use R lm() with quantitative and qualitative predictors, but am
getting different results than those that I get in SAS.
In the R ANOVA table documentation I see that "Type-II tests corresponds to the
tests produced by SAS for analysis-of-variance models, where all of the
predictors are factors, but not more generally (i.e., when there are
quantitative predictors)." Is
2008 Apr 24
2
alternatives to RColorBrewer?
I've found RColorBrewer useful for its qualitative palettes, but wished that
it could generate more than 12 qualitative palettes (e.g. with Set3). Any
suggestions for alternative color palette generators that can handle e.g. 18
distinctive colors? (I'm aware of using rainbow(), but this doesn't
generate enough distinct colors when the number of palettes is large).
Thanks,
Andrew
2012 May 29
1
Factor problem
HI!
I am working with a table with quantitative and qualitative data; one of
the columns is "Level of education", which is an ordered factor. I want to
get rid of the ordered factor, and set my own scale. How to do that? All
the time I get the following error:
In `[<-.factor`(`*tmp*`, educa = "Less than high school", value = 3) :
invalid factor level, NAs generated