Graphics Reference
In-Depth Information
Figure
.
.
he let frame shows a scatterplot of the average winter midpoint temperature and the
logarithm of the total precipitation for Colorado PRISM data. he right frame displays an image plot for
a bivariate histogram with the same data
frame, an image plot is used to display a bivariate histogram of the data. he bin-
widths for the histogram were determined based loosely on the normal based rule
discussed earlier. Agreyscale is used to displaythe density of points in each bin with
darker shades indicating a higher density. Far more of the structure in the data ap-
pears, as it is clear that there are at least two modes in the data, including one sharp
mode represented by the higher temperatures and lower precipitation of the eastern
plains andamuchmorebroad moderepresenting thelower temperaturesand higher
precipitation in the mountains.
Figure
.
.
A bivariate histogram of the Colorado PRISM data using a hexagonal mesh. Shading is as
in the right panel of Fig.
.
