Balance amount.
Total contributions made.
Total interest earned.
Number of years.
Contribution frequency.
Compounding frequency.
Compounding period details.
Time-weighted annual return (TWR) — the strategy's investment performance, independent of contribution timing.
Calculated as the annualized geometric mean of the period-by-period returns: (product of (1 + r_i))^(periodsPerYear / n) - 1.
For constant-rate strategies this reduces to the effective annual yield (EAR). For glidepath strategies this is the time-weighted average of the path of returns.
This is the metric to compare against benchmarks (e.g., the S&P 500 return over the same window). At a constant rate the money-weighted return is the same number, so it is not reported separately.
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Object representing compounding interest calculations.