Hi, After several days of google searches, checking colormaps, R coding, sleepless nights, etc., I would really appreciate some advice from the experts :-)
I have a matrix of p-values. It is possible to use "image" to display this matrix, using a custom colormap. I am very cautious about using colormaps to display quantitative data like p values, because it is too easy to generate images that mislead our perceptions of the values. This web page has some nice information and helpful links on this topic: http://research.stowers-institute.org/efg/R/Color/Chart/index.htm There are many choices for colors in R, can you recommend good color maps to display p-values? I would like to display categorical p-values. Does anyone have a nice colorbar to display categorical values for the common alpha levels: 0.000 <= p < 0.001 0.001 <= p < 0.01 0.010 <= p < 0.05 0.050 <= p < 0.1 0.100 <= p <= 1 The transform pLogMatrix <- -log10(pValueMatrix) is useful for display of these values. Any comments on visualizing this? Thanks in advance, Darren L. Weber, Ph.D. UCSF Dept. of Radiology PS, the attachment is a playground for this, where the p matrix is defined for a categorical variable (on y axis) and a continuous variable (on x axis).
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