cluster sampling Alejandra Gonzalez-Beltran Cluster sampling is a sampling plan used when mutually homogeneous yet internally heterogeneous groupings are evident in a statistical population. Philippe Rocca-Serra cluster(data, clustername, size, method=c("srswor","srswr","poisson", "systematic"),pik,description=FALSE) from: https://www.rdocumentation.org/packages/sampling/versions/2.8/topics/cluster Sampling R package https://en.wikipedia.org/wiki/Cluster_sampling systematic sampling ready for release