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I have used the SMA and EMA in charting and in the short term time frame they are usually pretty close to each other. I recently conducted some longer term scans using the SMA 150 using and plotted a chart. For comparison, I plotted both the SMA 150 and the EMA 150 on the same chart and was amazed as to the difference between the SMA and the EMA over 150 days. It appears that on a shorter time frame the SMA and EMA are fairly close to each other. However on a longer time frame, there can be quite a divergence. Why is that and with a longer time frame of say... 150 days, which EMA is more representative to determine the trend?