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026-ParaB Sings: "Choosing a Sample"

posted Apr 10, 2013, 8:34 PM by Gregory Taylor   [ updated Apr 10, 2013, 8:41 PM ]
PARAB SINGS 06

(y-k)2 - 4p(x-h) presents....

"Choosing a Sample"
  (*aka "Eleanor Rigby",  The Beatles)

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Official Video: Found Here
Lyrics Only Reference: YouTube Here

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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.


All the ways to sample.
    (Ahhh, look at all the ways to sample!)
How do we choose just one?
All the ways to sample.
    (Ahhh, look at all the ways to sample.)

Now can you be random?


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