bacteria: Bacteria from Delaware River water entering the Torresdale...
In rwoldford/qqtest: Self Calibrating Quantile-Quantile Plots for Visual Testing
Description
Usage
Format
Details
Source
Description
The number of bacteria per cubic centimetre was measured daily
for river water entering the Torresdale filter of the Philadelphia
water supply through the whole of 1913.
Usage
1
Format
A data frame with 22 rows and 2 variates:
- count
Number of bacteria per cc.
- percentTime
Percent of days (out of 365) having bacteria count
less than or equal to the measured count.
Details
Rather than the individual daily results, recorded here are 22 values
together with the percentage of days whose value was less than or equal
to the recorded value.
These quantiles are therefore based on 365 daily measurements.
Values were taken from a logarithmic-normal probability plot dated
January 21, 1915 as it appeared in Figure 22 of George C. Whipple's
1916 (Part 2) paper on the “Element of Chance in Sanitation”.
This paper introduces logarithimic-normal probability paper (or a log-normal qqplot).
with(bacteria, plot(qnorm(percentTime/100), log(count,10), type="o"))
reproduces Whipple's 1915 plot.
with(bacteria, qqtest(data=count, p=percentTime/100, np=365, dist="log-normal", type="o"))
will effect a qqtest plot for this data. More detail can be had from:
with(bacteria, qqtest(data=log(count, 10), p=percentTime/100, np=365, dist="normal", type="o"))
Source
"The Element of Chance in Sanitation",
George C. Whipple, Journal of the Franklin Institue, Volume 182,
July and August (1916), pp. 37-59 and 205-227.
Data taken directly from Figure 22, page 209.
rwoldford/qqtest documentation built on April 2, 2020, 9:44 p.m.
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Description Usage Format Details Source
Description
The number of bacteria per cubic centimetre was measured daily for river water entering the Torresdale filter of the Philadelphia water supply through the whole of 1913.
Usage
1 |
Format
A data frame with 22 rows and 2 variates:
- count
Number of bacteria per cc.
- percentTime
Percent of days (out of 365) having bacteria count less than or equal to the measured count.
Details
Rather than the individual daily results, recorded here are 22 values together with the percentage of days whose value was less than or equal to the recorded value. These quantiles are therefore based on 365 daily measurements.
Values were taken from a logarithmic-normal probability plot dated January 21, 1915 as it appeared in Figure 22 of George C. Whipple's 1916 (Part 2) paper on the “Element of Chance in Sanitation”. This paper introduces logarithimic-normal probability paper (or a log-normal qqplot).
with(bacteria, plot(qnorm(percentTime/100), log(count,10), type="o"))
reproduces Whipple's 1915 plot.
with(bacteria, qqtest(data=count, p=percentTime/100, np=365, dist="log-normal", type="o"))
will effect a qqtest plot for this data. More detail can be had from:
with(bacteria, qqtest(data=log(count, 10), p=percentTime/100, np=365, dist="normal", type="o"))
Source
"The Element of Chance in Sanitation", George C. Whipple, Journal of the Franklin Institue, Volume 182, July and August (1916), pp. 37-59 and 205-227. Data taken directly from Figure 22, page 209.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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