The number of iPhones sold today at an apple store is an example of Ratio data.
A type of quantitative (numeric) data is ratio data. With equal space between neighboring values, it assesses variables on a continuous scale. The fact that ratio data has a "real zero" sets it apart from interval data, another sort of quantitative data, even though they both share these characteristics.
By averaging the ratio of treated/control logarithms, a ratio t-test investigates the null hypothesis that the population mean of that group of logarithms is zero. Since the ratio t-test uses logarithms to calculate its results, it cannot be performed if any number is 0 or negative.
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