026-ParaB Sings: "Choosing a Sample"

Post date: Apr 11, 2013 3:34:39 AM

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Ahhh, look at all the ways to sample.

Ahhh, look at all the ways to sample!

For systematic, pick every Nth, from a list, of the population.

Until you're done.

Stratified sample, grouping by trait, taking some, from each group, it makes sense.

By the percents!

All the ways to sample.

How do we choose just one?

All the ways to sample.

How can we be random?

For cluster sample, groupings must each represent, from the big, to the small.

From some pick all.

Multi-stage sample, grouping's the same, represent, but to time, we succumb.

From some pick some.

All the ways to sample.

How do we choose just one?

All the ways to sample.

How can we be random?

Ahhh, look at all the ways to sample.

Ahhh, look at all the ways to sample!

Convenience sample, see who's around and they'll do, probability's missed.

Bias exists.

Destructive sample, quality test, now it's gone, and there's fewer to spare.

Use it with care.

Now can you be random?