Lecture 3: Measuring Ethnic Diversity in the Neighborhoods of New York
Herfindahl Index
$$ H=\sum_{i=1\ldots N} (S_i)^2 $$ (where $$S_i$$ is share of group $$i$$, and $$N$$ is number of groups)
Ethnolinguistic Fractionalization Index
$$ {ELF}=1-H $$
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