Hi All,

I am trying to understand how to use ATR and have noticed something that puzzles me: the ATR numbers vary considerably between time periods on the chart, even for the same date.

e.g. 
Yahoo Finance chart (as I find the ATR on the Stockopedia chart to lack detail):
  For the FTSE 100  index the ATR(14) for the 25/09/2020 is around 100 on a 3M, 6M and 1Y chart. But on a 2Y chart around the same date, the ATR(14) is about 275.

Can anyone explain why there is such a massive difference?

Thanks,
Wayne

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