plot.mdqc {mdqc} | R Documentation |
The plot method for a MDQC object, which plots ...
## S3 method for class 'mdqc': plot(x, levels = c(0.9, 0.95, 0.99), xlab="", ylab="", mfrow=NULL, mfcol=NULL, ...)
x |
An object of the class ‘mdqc’. |
levels |
A vector or scalar between 0 and 1 for displaying critical values for outliers. See details. |
xlab |
The label for for x-axis. Note that when there are multiple plots, the same value of this argument is used for each one. |
ylab |
The label for the y-axis. Note that when there are multiple plots, the same value of this argument is used for each one. |
mfrow |
Specify the arrangement of plots on the page, by rows, or leave NULL to let the function work it out |
mfcol |
As for mcol, but arrange plots by column instead |
... |
Other arguments passed to the default plot method. |
This plot method is for the output from the function
mdqc
, and plots the Mahalanobis distances for each
array. The levels
argument plots horizontal lines at critical
values (based on the quantiles of a chi-squard distribution), and aids
in identifying outliers.
For further details, see Cohen Freue et al. (2007)
Justin Harrington harringt@stat.ubc.ca and Gabriela V. Cohen Freue gcohen@stat.ubc.ca.
Cohen Freue, G. V. and Hollander, Z. and Shen, E. and Zamar, R. H. and Balshaw, R. and Scherer, A. and McManus, B. and Keown, P. and McMaster, W. R. and Ng, R. T. (2007) ‘MDQC: A New Quality Assessment Method for Microarrays Based on Quality Control Reports’. Bioinformatics 23, 3162 – 3169.
data(allQC) mdout <- mdqc(allQC, method="cluster", k=3) plot(mdout) ## Just one critical value plot(mdout, levels=0.9)