Geoscience Reference
In-Depth Information
For the second parameter, block length, the mean block length for each block
group ranges from 154 to 737 ft, with a mean of 276 and a standard deviation of
93. Figure 7.4 shows the distribution of rescaled values of the mean block lengths
as both a histogram and an unclassed choropleth map.
For the third parameter, building age, the results reflect the standard deviation
within each block group. Of the 180,836 ownership points, 14,339 (7.9 % of the
dataset) did not have any valid year information available. These were excluded
from the analysis, resulting in the use of 166,497 points. The invalid points were
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