mytest > help > Part 2. MM4XL Tools > 3. Charts and Maps > Smart Mapping > Why and How to Re-scale Quadrants

Smart Mapping

Why and How to Re-scale Quadrants

Smart Mapping offers three options for re-scaling quadrants: Median, Mean and Equal size. The last option yields equally scaled quadrants and it is computed using the formula:

Bubble Maps Software for Scatter Plot and Circle Charts

Median and mean correspond to the common statistics. The pictures below show what happens when the same data is plotted using each of the three options.

The position of the bubbles does not change, merely the origin of the map changes position.

Bubble Maps Software for Scatter Plot and Circle Charts

The Meanoption is used when the data of each variable is homogeneous; i.e. there are no excessively high or low figures within each variable. If there are abnormal values the Medianoption should be used. The median value of a series is simply computed ordering all figures in an ascending order and selecting the mid-point value. If, for example, there were seven items in a list, say 1, 2, 3, 4, 5, 6, and 170 the median value would be 4. With this computation we avoid computing a mean value of 27.3, which would certainly not be representative of the dispersion in the variable.

Finally, the Equal sizeoption (Min+Max)/2 is useful to simplify the visual inspection of normally distributed values. In fact, the analyst has a clear picture of the space left above or below both tails of the variable.

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