pre_correct: Calculate correct rate of buy and sell signal, based on stock...
In purplezippo/quantler: Quant Develop Tools

Calculate correct rate of buy and sell signal, based on stock price

1	pre_correct(stock.price = NA, strategy.b = NA, strategy.s = NA)

`stock.price`	a one dimension vector of numeric data, which represents a time series of stock price.
`strategy.b`	the trade signal of buy operation consists of a one dimension vector contians integer values of -1,0,1, of which '-1' equals to 'sell','0' equals to 'hold' and '1' equals to 'buy'.
`strategy.s`	the trade signal of sell operation consists of a one dimension vector contians integer values of -1,0,1, of which '-1' equals to 'sell','0' equals to 'hold' and '1' equals to 'buy'.