gvisBubbleChart(data, idvar = "", xvar = "", yvar = "", colorvar = "",
sizevar = "", options = list(), chartid)data.frame to be displayed as a bubble chart.
The data has to have at least three columns for idvar, xvar, and
yvar.data with the bubbledata to be plotted
on the x-axis.data to be plotted
on the y-axis.series osizeAxis option.