That's why I said: I don't want to do it for myself, so I will do it for money or not do it at all
I meant timeframe = period. I used the term period to mean a repeating distance between two timeframes. I'm basically trying to figure out the slope so I can determine how "dangerous" it is to hold onto bitcoin over a period of time.
merchant foo sells food and wants bitcoins as payment to increase his customers but foo doesn't believe in bitcoins and so he wants his bitcoins converted to fiat immediately. So how long can it be bitcoin before it becomes dangerous?
I looked at april's crash and I think it dropped from 250 to 105 at mt gox vs USD in about 6 hours, but I do not have the tools to determine the actual slope. I can't imagine the crash is all that useful as a guide anyway. I'd think I want to throw out that data-point as an outlier. I'm kind of trying to determine a "most likely decline in one hour vs USD" scenario so I can figure out how to mitigate that risk.
But I am not a mathematician, only a lowly coder. I am not a day trader and do not understand your terminology.