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When your data has different values, and even different measurement units, it can be difficult to compare them. What is kilograms compared to meters? Or altitude compared to time? The answer to this problem is scaling. We can scale data into new values that are easier to compare. Take a look at the table below, it is the same data set that we used in the multiple regression chapter, but this time the volume column contains values in liters instead of cm
(1.0 instead of 1000).
1.0 790 99
1.2 1160 95
1.0 929 95
500 0.9 865 90
1.5 1140 105 VW Up! 1.0 929 105
1.4 1109 90
1.5 1365 92
1.5 1112 98
A1 1.6 1150 99
I20 1.1 980 99