The Muscle
data frame has 60 rows and 3 columns.
This data frame contains the following columns:
an ordered factor indicating the strip of muscle being measured.
a numeric vector giving the concentration of CaCl2
a numeric vector giving the shortening of the heart muscle strip.
Baumann and Waldvogel (1963) describe data on the shortening of heart muscle strips dipped in a \(\mbox{CaCl}{}_2\) solution. The muscle strips are taken from the left auricle of a rat's heart.