Question: =+y 5 error percentage for subjects reading a four-digit liquid crystal display x1 5 level of backlight (from 0 to 122 cd/m) x2 5 character
=+y 5 error percentage for subjects reading a four-digit liquid crystal display x1 5 level of backlight (from 0 to 122 cd/m)
x2 5 character subtense (from .025° to 1.34°)
x3 5 viewing angle (from 0° to 60°)
x4 5 level of ambient light (from 20 to 1500 lx)
The model equation suggested in the article is
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