sam.plot2 {siggenes} | R Documentation |
Generates a SAM plot for a specified value of Delta.
sam.plot2(object, delta, pos.stats = NULL, sig.col = 3, xlim = NULL, ylim = NULL, main = NULL, xlab = NULL, ylab = NULL, pty = "s", lab = c(10, 10, 7), pch = NULL, sig.cex = 1, ...) plotArguments(pos.stats = NULL, sig.col = 3, xlim = NULL, ylim = NULL, main = NULL, xlab = NULL, ylab = NULL, pty = "s", lab = c(10, 10, 7), pch = NULL, sig.cex = 1)
object |
an object of class SAM |
delta |
a numeric value specifying the value of Delta for which the SAM plot should be generated |
pos.stats |
an integer between 0 and 2. If pos.stats=1 , general
information as the number of significant genes and the estimated FDR for
the specified value of delta will be plotted in the upper left corner
of the plot. If pos.stats=2 , these information will be plotted in
the lower right corner. If pos.stats=0 , no information will be plotted.
By default, pos.stats=1 if the expression score d can be both
positive and negative, and pos.stats=2 if d can only take positive
values |
sig.col |
a specification of the color of the significant genes. If sig.col
has length 1, all the points corresponding to significant genes are marked in the
color specified by sig.col . If length(sig.col)==2 , the down-regulated
genes, i.e. the genes with negative expression score d, are marked in the
color specified by sig.col [1], and the up-regulated genes, i.e. the genes
with positive d, are marked in the color specified by sig.col [2].
For a description of how colors are specified, see ?par |
xlim |
a numeric vector of length 2 specifying the x limits (minimum and maximum) of the plot |
ylim |
a numeric vector of length 2 specifying the y limits of the plot |
main |
a character string naming the main title of the plot |
xlab |
a character string naming the label of the x axis |
ylab |
a character string naming the label of the y axis |
pty |
a character specifying the type of plot region to be used. "s" (default)
generates a square plotting region, and "m" the maximal plotting region |
lab |
a numeric vector of length 3 specifying the approximate number of tickmarks on the x axis and on the y axis and the label size |
pch |
either an integer specifying a symbol or a single character to be used as the
default in plotting points. For a description of how pch can be specified, see
?par |
sig.cex |
a numerical value giving the amount by which the symbols of the significant genes should be scaled relative to the default |
... |
further graphical parameters. See ?plot.default and ?par |
a SAM plot
SAM was deveoped by Tusher et al. (2001).
!!! There is a patent pending for the SAM technology at Stanford University. !!!
Holger Schwender, holger.schw@gmx.de
Tusher, V.G., Tibshirani, R., and Chu, G. (2001). Significance analysis of microarrays applied to the ionizing radiation response. PNAS, 98, 5116-5121.
SAM-class
,sam
,sam.dstat
,sam.wilc
,
sam.snp
## Not run: # Load the package multtest and the data of Golub et al. (1999) # contained in multtest. library(multtest) data(golub) # Perform a SAM analysis for the two class unpaired case assuming # unequal variances. sam.out<-sam(golub,golub.cl,B=100,rand=123) # Generate a SAM plot for Delta = 2 sam.plot2(sam.out,2) # Alternatively way of generating the same SAM plot plot(sam.out,2) ## End(Not run)