Description Usage Format Source References Examples
The urine
data frame has 77 rows and 7 columns.
79 urine specimens were analyzed in an effort to determine if certain physical characteristics of the urine might be related to the formation of calcium oxalate crystals.
1 |
This data frame contains the following columns:
r
indicator of the presence of calcium oxalate crystals;
gravity
the specific gravity of the urine, i.e. the density of urine relative to water;
ph
the pH reading of the urine;
osmo
the osmolarity of the urine. Osmolarity is proportional to the concentration of molecules in solution (mOsm).
conduct
The conductivity of the urine. Conductivity is proportional to the concentration of charged ions in solution (mMho milliMho).
urea
the urea concentration in millimoles per litre;
calc
the calcium concentration in millimoles per litre.
The data were obtained from
Andrews, D. F. and Herzberg, A. M. (1985) Data: A Collection of Problems from Many Fields for the Student and Research Worker, Cambridge: Cambridge University Press.
Davison, A. C. and Hinkley, D. V. (1997). Bootstrap Methods and Their Application (Example 7.8). Cambridge: Cambridge University Press.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | data(urine)
summary(urine)
pairs(urine)
##
data(urine)
urine.glm <- glm(r ~ gravity + ph + osmo + conduct + urea + log(calc),
family = binomial, data = urine)
labels(coef(urine.glm))
urine.cond <- cond(urine.glm, log(calc))
##
## (large estimate of regression coefficient)
urine.glm <- glm(r ~ gravity + ph + osmo + conduct + urea + calc,
family = binomial, data = urine)
coef(urine.glm)
urine.glm <- glm(r ~ I(gravity * 100) + ph + osmo + conduct + urea + calc,
family = binomial, data = urine)
coef(urine.glm)
urine.cond <- cond(urine.glm, I(gravity * 100))
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Loading required package: statmod
Loading required package: survival
Package "cond" 1.2-3 (2014-06-27)
Copyright (C) 2000-2014 A. R. Brazzale
This is free software, and you are welcome to redistribute
it and/or modify it under the terms of the GNU General
Public License published by the Free Software Foundation.
Package "cond" comes with ABSOLUTELY NO WARRANTY.
type `help(package="cond")' for summary information
r gravity ph osmo conduct
0:44 Min. :1.005 Min. :4.760 Min. : 187.0 Min. : 5.10
1:33 1st Qu.:1.012 1st Qu.:5.530 1st Qu.: 410.0 1st Qu.:14.30
Median :1.018 Median :5.940 Median : 594.0 Median :21.40
Mean :1.018 Mean :6.041 Mean : 613.6 Mean :20.91
3rd Qu.:1.024 3rd Qu.:6.400 3rd Qu.: 803.0 3rd Qu.:27.00
Max. :1.040 Max. :7.940 Max. :1236.0 Max. :38.00
urea calc
Min. : 10.0 Min. : 0.17
1st Qu.:159.0 1st Qu.: 1.45
Median :255.0 Median : 3.16
Mean :262.4 Mean : 4.16
3rd Qu.:362.0 3rd Qu.: 6.19
Max. :620.0 Max. :14.34
[1] "(Intercept)" "gravity" "ph" "osmo" "conduct"
[6] "urea" "log(calc)"
(Intercept) gravity ph osmo conduct
-355.33770709 355.94379390 -0.49570188 0.01681128 -0.43281891
urea calc
-0.03201315 0.78369128
(Intercept) I(gravity * 100) ph osmo
-355.33770709 3.55943794 -0.49570188 0.01681128
conduct urea calc
-0.43281891 -0.03201315 0.78369128
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