gellibrand: Magnetic Variation at Deptford, England in 1635
In jrnold/datums: Miscellaneous Data Sets

Description Usage Format Details Source References See Also

Henry Gellibrand's data for readings of the variation between magnetic and true north using the Sun's taken at Deptford, England.

1	gellibrand

A data frame with 11 rows and 5 columns.

name	type	description
`afternoon`	`"logical"`	Reading was taken in the afternoon
`altitude`	`"numeric"`	Altitude of the Sun in degrees
`azim_mag`	`"numeric"`	Magnetic azimuth in degrees
`azim_sun`	`"numeric"`	Azimuth of the Sun in degrees
`variation`	`"numeric"`	Variation between true and magnetic north in degrees

It is the first known use of the term "meane" (mean) to refer to a statistic. However, what he calls the measures of magnetic variations which he calculates, 4 degrees 5 minutes, is the mid-range of the data.

Stigler, S. M. (2016) The Seven Pillars of Statistical Wisdom, p. 24

Stigler, S. M. (2016) The Seven Pillars of Statistical Wisdom

db1668 and borough for other early datasets used to (almost) calculate means.

jrnold/datums documentation built on May 20, 2019, 1 a.m.