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What are the common moving averages used in a “Golden Cross” stock evaluation?
The 'standard' in such moving average crossover systems is 50/200. The numbers are essentially arbitrary as long as the long term average is greater than the short term and there is some different between the averages in terms of the smoothing they provide (i.e. comparing a 74 day MA to a 75 day MA isn't what the system is intended for) There are plenty of software programs that will let you run through many possible values for the system over historical data. I concur with the other answers in that this system/indicator alone isn't very good. However, I disagree with their blanket brushing off of technical analysis. There are many successful traders out there. The moving average cross over system is perhaps the second most primitive example of technical strategies categorized as trend following systems (buying new recent highs and selling new recent lows being the most simple). This particular system isn't very powerful because of its poor use of simple moving averages. A simple moving average is intended to smooth out data, but smoothing comes at the cost of lagging from the present. A simple moving average essentially gives you an idealized smoothing of price action for the day at that is one half of their period ago. So your 200 day simple moving average shows you an idealized smoothing of price action 100 days ago. A lot can happen in 100 days and that is why this system is far from ideal.