fit.cgPairedDifferenceData {cg} | R Documentation |
Fit models to a cgPairedDifferenceData object
Description
Fits a paired difference model based
on the cgPairedDifferenceData
object. The
created object is designed for paired samples
collected data, and is of class cgPairedDifferenceFit
.
Usage
## S4 method for signature 'cgPairedDifferenceData'
fit(data, type="rr", ...)
Arguments
data |
A data object of class |
type |
Type of model to fit, represented by a character
value. The default value is
|
... |
Additional arguments, both optional, that are allowed to be specified dependent on
the choice of the
|
Details
In the current version of the cg package, most default settings
for rlm
are kept for the
fit.cgPairedDifferenceData
method wrapper call when
type="rr"
, with no capability to choose
another value for an arguments such as psi
, scale.est
,
and k2
. The method
argument is set to "MM"
.
Value
Creates an object of class cgPairedDifferenceFit
, with the
following slots:
olsfit
The contents of a
lm
fit to the data. This is always populated with anlm
object no matter the choice of thetype
argument, such ascode="rr"
.rrfit
The contents of a
rlm
fit to the data, housed as arrfit
class object. Iftype="rr"
is not selected, then this is set to a simple character value of"No fit was selected."
.settings
A list of properties carried as-is from the
data
argument object of classcgPairedDifferenceData
. In particular, ifzeroscore
is specified as a non-NULL
number in thecgPairedDifferenceData
object in thedata
argument, then a score value near zero was derived to replace all zeroes for subsequent log-scale analyses. Alternatively, ifaddconstant
is specified as a non-NULL
number in thecgPairedDifferenceData
object in thedata
argument, then a value was added to shift up all observations for subsequent log-scale analyses.
Note
Contact cg@billpikounis.net for bug reports, questions, concerns, and comments.
Author(s)
Bill Pikounis [aut, cre, cph], John Oleynick [aut], Eva Ye [ctb]
References
Venables, W. N. and Ripley, B. D. (2002), Modern Applied Statistics with S. Fourth edition. Springer.
Examples
data(anorexiaFT)
anorexiaFT.data <- prepareCGPairedDifferenceData(anorexiaFT, format="groupcolumns",
analysisname="Anorexia FT",
endptname="Weight",
endptunits="lbs",
expunitname="Patient",
digits=1, logscale=TRUE)
anorexiaFT.fit <- fit(data=anorexiaFT.data, type="rr")