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mosaic (version 0.5-1)

Flicker: Critical Flicker Frequency (CFF) and Eye Color

Description

There is various flickering light in our environment; for instance, light from computer screens and fluorescent bulbs. If the frequency of the flicker is below a certain threshold, the flicker can be detected by the eye. Different people have slightly different flicker "threshold" frequencies (known as the "critical flicker frequency," or CFF). Knowing the critical threshold frequency below which flicker is detected can be important for product manufacturing as well as tests for ocular disease. Do people with different eye color have different threshold flicker sensitivity? A 1973 study ("The effect of iris color on critical flicker frequency," Journal of General Psychology [1973], 91-95) obtained the following data from a random sample of subjects.

Usage

data(Flicker)

Arguments

format

A data frame with 19 observations on the following variables.

  • color
{eye color: Brown, Green, or Blue} cff{Critical Flicker Frequency}

References

Part of the Carnegie Mellon University Online Learning Initiative datasets.