Explain lie factor, Advanced Statistics

Lie factor: A measure suggested by Tufte for judging the honesty of the graphical presentation of data. Which can be calculated as follows

1185_lie factor.png 
The values close to one are desirable but it is not uncommon to find the values close to zero and greater than five. The instance shown in the figure has a lie factor of about 2.8. 

2303_lie factor1.png

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