The methods of calculating the various weighting schemes is best explained by examples:
Example: Price Weighted Series
Given the following series data, calculate the price weighted return over a one-year period.

Stock Price Info for Series 1

Answer:
To calculate the return over a one-year period, first calculate the price weighted series value at each date.

The one-year return for the price weighted series would thus be (45/40) - 1 = 12.5%

Example: Market Weighted Series
Given the following series data, calculate the market weighted return over the one-year period.

Stock Price Info for Series 2

Answer:

Example: Unweighted Series
Given the following series data, calculate the unweighted return over a one-year period.

Stock Price Info for Series 3

Answer:
Geometric Average = (1.05 x 1.25 x 1.00 x 1.30)1/4 = 1.143


Domestic vs. Global Indexes

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