Update buying and selling price for the trading strategy

[timmulvaney]

Error in buying and selling used mid-price instead of ask1 or bid1

[timmulvaney]

After extensive testing, it was found that due to the decreasing liquidity and increasing difference between ask1 or bid1.

The strategy either: A buys, shares initially but then never sells Makes almost no buys or sells.

[timmulvaney]

In order to allow the comparison of the models to trading signals, the mid-price will be continued to be used.

This issue will be discussed in the report with the suggestions of using a more varied threshold