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Almost everything that can be measured or counted in humans shows
variation around the mean value for the population.
shows the pattern of variation for self-reported weight (lb.) in a
U.S. sample. The
observation that individuals differ is almost universal and covers the
entire spectrum of measurable traits, whether they be physical
such as stature or weight, physiological such as heart rate
or blood pressure, or psychological such as personality,
abilities, mental health, or attitudes. The methods we shall describe are concerned
with explaining why these differences occur.
Variability in self reported weight in a sample of US twins.