vision: Acuity of vision in response to light flash

In faraway: Functions and Datasets for Books by Julian Faraway

Acuity of vision in response to light flash

Description

The acuity of vision for seven subjects was tested. The response is the lag in milliseconds between a light flash and a response in the cortex of the eye. Each eye is tested at four different powers of lens. An object at the distance of the second number appears to be at distance of the first number.

Format

A data frame with 56 observations on the following 4 variables.

acuity

a numeric vector

power

a factor with levels 6/6 6/18 6/36 6/60

eye

a factor with levels left right

subject

a factor with levels 1 2 3 4 5 6 7

Source

Crowder, M. J. and D. J. Hand (1990). Analysis of Repeated Measures. London: Chapman & Hall.

Examples

data(vision)
## maybe str(vision) ; plot(vision) ...

faraway documentation built on Aug. 23, 2022, 5:08 p.m.