Involves collecting past data, extending or implying trends through the use of scatter plots and regression lines, and comparing the trend line with the current capacity of the system. Although linear projection is used quite frequently to make assumptions about future behavior, the performance of computer systems is far from linear. Therefore, any linear relationship determined between two system components should only be used to understand the current (or past) behavior. Linear projection is best used when you want a first approximation to a very simple model.
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