Laspeyres' Index

The statistical Index

$$P_L\equiv {\sum p_nq_0\over\sum p_0q_0},$$

where $p_n$ is the price per unit in period $n$ and $q_n$ is the quantity produced in period $n$.

See also Index

References

Kenney, J. F. and Keeping, E. S. Mathematics of Statistics, Pt. 1, 3rd ed. Princeton, NJ: Van Nostrand, pp. 65-67, 1962.