The urine
data frame has 79 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.
urine
This data frame contains the following columns:
r
Indicator of the presence of calcium oxalate crystals.
gravity
The specific gravity of the urine.
ph
The pH reading of the urine.
osmo
The osmolarity of the urine. Osmolarity is proportional to the concentration of molecules in solution.
cond
The conductivity of the urine. Conductivity is proportional to the concentration of charged ions in solution.
urea
The urea concentration in millimoles per litre.
calc
The calcium concentration in millimoles per litre.
Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Methods and Their Application. Cambridge University Press.