Is unequal ratio stratified sampling a self-weighted design?

Unequal proportional stratified sampling is a self-weighted design.

Hierarchical random sampling, also known as type random sampling, is to divide the overall unit into various types (or levels) according to certain standards; Then, according to the ratio of the number of units of each type to the total number of units, the number of sample units extracted from each type is determined; Finally, according to the principle of randomness, samples are extracted from various types.

sample

Sampling is also called sampling. Extract some sample units from all the samples to be studied. Its basic requirement is to ensure that the sampling unit can fully represent all samples. The purpose of sampling is to estimate and infer all the sample characteristics from the analysis and research results of the sampled sample units, which is an economical and effective work and research method commonly used in scientific experiments, quality inspection and social surveys.