This value serves as a comparison between systematic and stratified sampling precision.
At value=1 the systematic precision is minimum. At value=0 both sampling methods precision
are equal. At value= \(\frac{-1}{n-1}\) systematic precision is maximum.
Summarising at values between 1 and 0 stratified sampling estimation has more precision
than systematic, so method="strata" should be set at syst.estimator.
The other way method="syst" of interpenetrating samples method is better.