Archive / Investment Adviser (Level 1) / Portfolio Performance Measurement and Evaluation

nism-series-xa-rolling-returns-vs-point-to-point-cagr-bias[ INVESTMENT ADVISER (LEVEL 1) ]

Why is Rolling Returns analysis considered superior to Point-to-Point CAGR for assessing long-term fund performance consistency?

[ A ]Rolling returns analyze performance across hundreds of overlapping holding windows, eliminating the distorting bias of specific start and end dates and revealing consistency across market cycles[ CORRECT ]

[ B ]Rolling returns guarantee that a fund will never experience a negative return in the future

[ C ]Rolling returns calculate only the dividend yield of the portfolio

[ D ]Rolling returns are required by the Income Tax Act for capital loss computation

Takeaway

Rolling returns analyze performance across hundreds of overlapping holding-period windows, removing the distortion of cherry-picked start/end dates and revealing how consistent a fund's returns actually are across full market cycles.

Derivation

A single point-to-point CAGR figure is extremely sensitive to exactly when the measurement window starts and ends — measuring from a deep market trough to a subsequent peak can flatter a fund's CAGR dramatically, while the reverse (peak to trough) can make an otherwise good fund look poor, even though neither reflects typical investor experience. Rolling returns solve this by calculating the CAGR for every possible overlapping window of a given length (e.g., every 3-year period, rolled forward one month at a time) across a long historical dataset, producing a distribution of outcomes that shows how the fund performed regardless of which exact date an investor happened to invest — testing genuine consistency rather than a single lucky or unlucky measurement window.

Why the others fail

B — Rolling returns guarantee that a fund will never experience a negative return in the future

No statistical performance-measurement technique, including rolling returns, can guarantee that a fund will never post a negative return in the future — it analyzes historical consistency.

C — Rolling returns calculate only the dividend yield of the portfolio

Rolling returns compute multi-period CAGR across overlapping historical windows; this is a distinct calculation from dividend yield, which measures income distribution relative to price.

D — Rolling returns are required by the Income Tax Act for capital loss computation

Rolling returns are a voluntary performance-analysis technique used by analysts and advisers; they are not an Income Tax Act requirement for computing capital gains or losses.