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Wish I had a moment to help but busy until tomorrow. What I meant was to calculate the percent change in terror deaths after a security measure was put in place, and compare to times before the measure was adopted. Your final graph might only have two bars. Send me your raw data with the timeline, and I'll make an example of what I'm trying to say tomorrow morning, if you don't mind me butting in. Otherwise I'll just try to explain better when I have more time.