Success rate
Share of historical trades that finished above the short strike at expiration (CC) / above the put strike (CSP).
Strict success
Share of trades that hit success without ever touching the assignment zone intraday.
Premium yield
Premium received / capital required, per trade. CC denominator = stock cost; CSP denominator = strike × 100.
Annualized return
Mean of each historical trade's annualized total return, (1 + trade return) ^ (365 / DTE) − 1. Because it averages per-trade annualized ratios, short high-percentage winners pull it above annualizing the average return (Jensen's inequality) — read it as an upper bound, not a sustainable yield. The honest headline annualizes the mean return instead; the inflated_annualized risk flag fires when this figure exceeds 50%.
Median return
Median total return (premium + stock P&L) across the historical sample.
P10 / P90
10th / 90th percentile total return — the tails of the historical distribution.
Assigned
Share of historical trades where the short option finished ITM and shares were transferred at the strike.
OTM
Out-of-the-money at expiration — the short option expired worthless.
Deep ITM
Short option finished significantly past the strike (e.g. > 2% past) — missed upside on CC, larger loss on CSP.
Breakeven
CC: stock cost − premium received. CSP: strike − premium received.
Max profit
CC if assigned: strike − stock cost + premium. CSP if expires OTM: premium received.
Downside exposure
Stock value declines reduce CC returns; CSP loses if stock falls below breakeven.
Assignment probability
Probability the short option finishes ITM at expiration (delta is a rough proxy).
Early assignment risk
ITM short calls are at risk of assignment before expiration when ex-dividend falls inside the trade and remaining extrinsic value is below the dividend.
Opportunity cost
Returns forgone vs simply holding the stock — capped upside on CC, time-locked cash on CSP.
Missed upside
Gain above the strike that CC trader did not capture due to the cap.
Downside capture
Share of stock-only downside the strategy retained, even after premium offset.
Stock-only return
Hypothetical return of just holding the stock over the same window — baseline comparison.
CC excess return vs stock
Covered-call return minus stock-only return. Positive when premium > foregone upside.
CSP excess return vs cash
Premium yield on collateral minus cash / T-bill return over the same window.
Wheel cycle P&L
Total premium + stock P&L from one CSP → assignment → CC → called-away rotation.
Days in stock
Calendar days the wheel held assigned shares during the cycle.
Capital efficiency
Annualised return on capital, accounting for days-in-cash vs days-in-stock.
IV rank
Where current implied volatility sits in its 52-week range (0..100).
IV percentile
Share of days in the past 252 trading days where IV was below today's level.
Bid/ask spread
(ask − bid) / mid. Wide spreads make modelled mid yields harder to execute.
Open interest
Outstanding contracts on the strike. Below 100 makes the option illiquid.
Option volume
Today's traded contracts on the strike. Below 50/day is illiquid.
Liquidity grade
A / B / C / D / Unrated derived from bid/ask spread, OI, and volume.
Low-N sample warning
Backtest with n < 20 → low confidence; n < 5 → very low (do not treat as repeatable).