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"Tools to look at Interval or Ratio (Scale) Data December 31st, 2010 Interval Scale is use when we are measure the differences between observations. Difference between any two successive points is equal. Interval scale numbers that are equally different represent differences of equal magnitude. The zero vale of an interval scale is arbitrary. Often data of this scale are treated as a Ratio scale even if the assumption of equal intervals is incorrect. Some examples of Interval scale data is Calendar time, Voltage and  Temperature. Ratio Scales is like Interval Scale except it has a true zero point. In other words you can have nothing less than zero, on negative values. Some examples of ratio scale data  is Time, Distance, weight, Speed, ad Frequency."

A very nice site. Well explained. I'll be using it in the near future. Thank you for sharing it.