うそ表示指標

“The Visual Display of Quantitative Information" Edward R. Tufte

・show the data
・induce the viewer to think about the substance rather than about methodology, graphic design, the technology of graphic production, or something else
・avoid distorting what the data have to say
・present many numbers in a small space
・make large data sets coherent
・encourage the eye to compare different pieces of data
・reveal the data at several levels of detail, from a broad overview to the fine structure
・serve a reasonable clear purpose: descrtiption, exploration, tabulation, or decoration
・be closely integrated with the statistical and verbal descriptions of a data set.


グラフ表示の正確性測定
Lie factor = (size of effect shown in graphic)/(size of effect in data)

log(Lie Factor)
>0 :overstating
<0 :understating


うそ表示指標_a0007242_951739.jpg


実際には、“18.0” → “27.5”(53%増加)
表示上は、“0.5インチ” → “5.3インチ”(783%増加表示)

うそ要素(Lie factor)=783÷53=14.8

Log(Lie Factor)=1.17

嘘なし表示


うそ表示指標_a0007242_9191314.jpg

by internalmedicine | 2008-05-25 09:05 | 医療一般  

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