Plot the residuals against the predicted values 
. Does the variance appear to be constant?
Definitions:
Spermat/o
A combining form used in medical terms to refer to sperm or seed, indicating its relation to spermatozoa or the male reproductive cells.
Hydro
Pertaining to water; often used as a prefix in scientific and medical terms to indicate a relationship to water.
Ejaculat/o
A term referring to the expulsion of semen from the male reproductive tract.
Balan/o
A combining form used in medical terms that relates to the glans penis.
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