| sittingHeights {qqtest} | R Documentation |
Sitting height in inches of female adults (aged 23-50).
Description
From measurements made by Francis Galton at London's International Health Exhibition in 1884, published in 1885.
Usage
sittingHeights
Format
A data frame with 9 rows and 8 variates, the first 5 of which are as recorded by Galton:
- lowerBound
Sitting height greater than or equal to this lower bound in inches.
- upperBound
Sitting height strictly less than this upper bound in inches.
- nCases
Number of cases observed with sitting height between the two bounds.
- nCasesCumulative
Number of cases observed with sitting height up to but not including the upper bound.
- percentCumulative
Cumulative number of cases expressed as a percent.
- binCentre
Average of the lower and upper bounds.
- nCasesCentred
Number of cases assigned to the binCentre; half of cases observed with sitting height between the two bounds is assigned to be below the binCentre, half above (avoids producing 100 percent for last entry).
- proportionCumulativeAdjusted
Cumulative proportions using nCasesCentred.
Details
with(sittingHeights, plot(percentCumulative,upperBound, type="o", lwd=2, xlim=c(0,100), ylim=c(20,40),xlab="Percentage of women", ylab="Sitting heights in inches")) will effect Galton's Ogive.
with(sittingHeights, qqtest(binCentre, dist="normal", p = proportionCumulativeAdjusted, np=775, main="Sitting heights of women in inches")) will effect a normal qqplot for this data.
Source
"The Application of a Graphic Method to Fallible Measures", Francis Galton, (1885), Journal of the Statistical Society of London, Jubilee Volume (June 22-24, 1885), pp. 262-265.