Quality value is just a reflection of how many ticks were modelled to fill in the gaps between the OHLC. The OHLC can be considered "real Prices" as issued from the broker, we know the prices in between were also issued by the broker because they had to be, we just dont have an explicit record of them so they are "modelled" by the tester. The Higher timeframes use OHLC prices from lower time frame bars. This means the 1hr timeframe has 240 "real" OHLC prices from the 1M bars to use so less ticks need to be modelled. That is the only reason the 1hr timeframe has a higher quality rating.
The all important factor is to have 1M chart data to cover the entire period of higher timeframe testing.
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