One easy example using a stratified technique would be a sampling of peopleĪt ECC. ![]() Sample of 4 should have 1 blue, 1 green, and 2 reds.įor another take, watch this YouTube video: Working things out, we can see that a stratified (by color) random Individuals in the population are blue, so 1/4 of the sample should be blueĪs well. The number selected should be proportional. (Man, that's a weird word!) The key here is that Once we have the strata determined, we need to decide how many individuals We can easily separate the individuals by color. Visually, it might look something like the image below. Within each group should be similar in some way. Obtaining a proportional simple random sample from each group. The population into non-overlapping groups called strata and then Using some characteristic, and then take a proportional random sample fromĪ stratified sample is obtained by separating With this technique, we separate the population
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