[R] Interpreting Q-Q Plots

[Rich Shepard]

   My understanding of Q-Q plots is that if the tails of the plotted points
fall above or below the x=y line the distribution of observed/measured
values is under or over dispersed. But, how do I interpret measured values
that are in horizontal lines? The attached plot illustrates this situation.

TIA,

Rich
-------------- next part --------------
A non-text attachment was scrubbed...
Name: chromium_norm.pdf
Type: application/pdf
Size: 6232 bytes
Desc: 
URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20120514/f9a3eb13/attachment.pdf>