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I am trying to figure out the difference between a weekly and daily chart. I understand that a daily chart shows the daily values for a measure - in this case, I am looking at the RSI for the S&P 500. But what changes when you select a "weekly" chart? If I look at the RSI for July 7, 2014 on a daily chart, it is different than the RSI for July 7, 2014 on a weekly chart. What is explains the difference?