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Blip in % stocks above the 50 day EMA

I've noticed some blips in my breadth charts for the percentage of stocks above the 50 day EMA.  I've seen this in a number of charts but it shows particularly well in this one.  You can see the blip labelled near the bottom right hand corner of the chart.  I did wonder if such blips I had seen were owing to issues with my calculations, which is a significant possibility.  You also need to note that the breadth data here is from only 21 stocks - UK sectors are quite small.  However, I think not, you can see the index where it has risen above the 50 day SMAs and is now moving sideways.  I note two different average types - I won't go into the reasons here, they are not trivial and the 50 day EMA and 50 day SMA are close but definitely not identical.  Point is, a number of the index are looking similar to the index.

My conclusion is that the blip is real, it is owing to a number of stock passing above the 50 day EMA and then falling back.  Therefore such blips are something to look for when the index nears the 50 day or 200 day EMAs.