PPS Sampling Based on Correlation Research

PPS sampling has been widely used in the sampling survey, which uses the scale variable as the auxiliary information for the corresponding sampling design and estimation. With the development of various technologies and the advent of big data era, more and more available information turns up in the actual survey, how to select the appropriate variables as auxiliary information is a very important question. Indicator variable is introduced in the pps sampling. Then application method of auxiliary variable in the pps sampling is investigated.