I have a data set with historical prices (forex but I'm assuming it can be about stocks as well) - open, low, high, close - but there's two of each - bidopen, askopen etc. I want to use those data for calculation, for example MACD or stochastic oscilator. It would be easier if there was just the set of four prices for each day - but the set of data I have confused me.
If I want to do calculations - do I need to calculate average for every bid-ask pair, for example if I want open for a particular day do I calculate bidopen+askopen/2 ?
In both cases - MACD and stochastic oscillator - the calculation are meant to set points of buying and selling, but I buy using ask prices and I sell using bid prices... I know I am missing something but googling failed, I guess I don't know how to ask. I hope I managed to explain what is my problem above though.
Can somebody please explain what I'm missing? Or suggest sources where I could learn. Or both...