Glossary

Plain-English definitions. API symbols (Bar, Side, order()) are defined in the SDK reference.

• Bar, one period of price data: open, high, low, close, volume (OHLCV). See Bar.
• Resolution, the bar period: daily or minute. Determines the backtest model (intraday vs long).
• Intraday, trading that opens and closes positions within the same day, never holding overnight.
• Long (backtest model), a single funded account held and compounded across the whole test period.
• Position, how much of a symbol you hold; positive is long, negative is short.
• Fill, the moment an order becomes an executed trade, at a specific price. See Fills.
• Slippage, the gap between the price you expected and the price you got. (Not modeled yet.)
• Fee, broker/exchange cost per trade. (Not modeled yet.)
• Liquidation, closing all open positions, e.g. at an intraday session's close.
• Equity curve, account value over time.
• Drawdown, the drop from a peak in the equity curve; max drawdown is the worst such drop.
• Sharpe ratio, return per unit of volatility; intraday uses the daily P&L series, annualized.
• Exchange, the venue a symbol trades on. Today the SDK backtests US-equity data; see Markets & data.
• Ticker / symbol, a market's short code, like AAPL.