The Relative Performance Index in Streets allows a user to assess how a tree species is performing relative to all tree species in a community. It is based on the proportion of each individual species classified as "good" condition class divided by the total population of trees classified as good. In essence, it allows you to determine if a tree species is performing better or worse than the overall population based on either a below or above average condition rating.
See the following USFS CURFR report for a good description on using the RPI report. http://www.itreetools.org/streets/resou ... report.pdf
Section for FAQs regarding i-Tree Streets (STRATUM)
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