Inputs are most important to any decision making. For strategy backtesting, the OHLC data is one of the most inputs.
So to ensure the correctness and integrity of OHLC data, we have checks on the following OHLC issues:
- Outlier Price
- Negative Price
- Corrupted Price (High < Low, etc)
- Missing minute ticks in 1-min timeframe
However, there is a lacking of a standard or methodology to grade the data quality. So is there any standard / methodology to determine and grade the quality of the OHLC data?