Urine Analysis Data

SUMMARY:
       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.

DATA DESCRIPTION:
       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.

SOURCE:
       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. Springer-Verlag.

OTHER REFERENCES:
       Davison, A.C. and Hinkley, D.V. (1997)  Bootstrap  Methods
       and Their Application. Cambridge University Press.