stratified sampling vs proportional sampling

stratified sampling and proportional sampling both are nouns.

Word	Noun	Adjective	Verb	Adverb
stratified sampling	Yes	No	No	No
proportional sampling	Yes	No	No	No

As nouns, stratified sampling and proportional sampling are synonyms defined as:

stratified sampling and proportional sampling: the population is divided into subpopulations (strata) and random samples are taken of each stratum

Other synonyms of stratified sampling include representative sampling.

stratified sampling (noun)	proportional sampling (noun)
the population is divided into subpopulations (strata) and random samples are taken of each stratum	the population is divided into subpopulations (strata) and random samples are taken of each stratum