ArthaPilot Research
Research for portfolio decisions
Published studies with methods, evidence, and limitations.
9 published studies
Featured study
Lump sum vs. dollar-cost averaging
Compare immediate investment with a monthly schedule of equal principal portions across extended U.S. large-cap history. Explore when each approach finished ahead.
Published · Data through July 2026
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More studies
Portfolio research
The diversification illusion: how many issuers do your ETFs really own?
Compare issuer exposure in a VTI-and-BND example with common return patterns in a separate four-fund example.
Published
Household and tax
One household, four accounts
A fictional household's pinned 2026 snapshot compares current tax drag, constrained placement, transition paths, and income and cost-basis sensitivities.
Published
Portfolio research
Rebalancing frequency, turnover, and drift
A pretax comparison of turnover, return, and risk across seven frequencies for SPY and BND; implementation costs are not modeled.
Published
Portfolio research
The leverage wrapper game
Compare a 3x-fund blend, a 2x fund, and uniform financed leverage from 2018 through 2023.
Published
Portfolio research
A 200-day trend rule: an evidence audit
Inspect one SPY-or-SHY moving-average backtest, its turnover, and the additional tests needed to assess robustness.
Published
Portfolio research
Portfolio optimization before the out-of-sample test
One four-asset max-Sharpe fit with in-sample diagnostics; held-out evidence is absent.
Published
Household and tax
The hidden tax price of a sale
Trace proceeds, realized gains, and incremental taxes for two proposed sales, with reproducible inputs and results.
Published
Portfolio research
The factor doppelgänger
A VOO factor match using IVV, VTI, SCHB, ITOT, and SPY, with fitted weights, warnings, and residual diagnostics.
Published