Hii

  i have been trying to do a scatter plot with ggplot2, like the plot 6 here
(http://had.co.nz/ggplot2/geom_point.html) .. where the points size vary
with values

> p + geom_point(aes <http://had.co.nz/ggplot2/aes.html>(size = qsec))


  but am not sure how to setup the parameter - qsec

  could anyone please give some pointers on how to define that

thanks
Mo.

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