stratum

(noun)

a category composed of people with certain similarities, such as gender, race, religion, or even grade level

Related Terms

Examples of stratum in the following topics:

  • Lab 2: Sampling Experiment

    • Use 25% of the restaurants from each stratum.
    • Use 25% of the restaurants from each stratum.

  • Three sampling methods (special topic)

    • Stratified sampling is especially useful when the cases in each stratum are very similar with respect to the outcome of interest.
    • Why would it be good for cases within each stratum to be very similar?
    • We might get a more stable estimate for the sub-population in a stratum if the cases are very similar.
    • Strati ed sampling requires observations be sampled from every stratum.
    • In the middle panel, stratified sampling was used: cases were grouped into strata, and then simple random sampling was employed within each stratum.

  • Optional Collaborative Classrom Exercise

    • Create a cluster sample by considering each state as a stratum (group).

  • Lab 1: Normal Distribution (Lap Times)

    • Use a Stratified Sampling Method by Lap (Races 1 – 20) and a random number generator to pick 6 lap times from each stratum.

  • Random Sampling

    • At this stage, a simple random sample would be chosen from each stratum and combined to form the full sample.

  • Sampling

    • To choose a stratified sample, divide the population into groups called strata and then take a proportionate number from each stratum.
    • For example, you could stratify (group) your college population by department and then choose a proportionate simple random sample from each stratum (each department) to get a stratified random sample.