Changing the Bollinger Band's midline from SMA to EMA is not so good in terms of the standard deviation calculation formula, and it was hard to say that EMABB is an index that can be used by the author in different calculation formulas. This time, when I came up with the deviation, I came up with a method of weighting the latest deviation like EMA instead of the average and neglecting past deviations, so I made it. The variation in the calculation result seems to be difficult to handle, so the finished product is the one with smoothed EMA deviation.