What is the “alignment” parameter for binning?

[Dan Damelin]

If you bin cases there are two options to adjust how the binning occurs—bin width and alignment. What does the alignment parameter do?

 

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[Bill Finzer]

Hi Dan,

The alignment parameter ensures that a bin boundary will be aligned on that value. For example, if, for some reason, you need a bin to begin at the value 3, setting the alignment parameter to 3 will guarantee that.

Bill

[Jacob Sagrans]

If you don’t set the alignment parameter, is the default always to start the first bin at 0, even if there are negative values in the data? Also, I tried changing the alignment for bins for mammals’ lifespan from 0 to 10, and it gave me a bin of [-10, 10), even though there are of course no negative values for this attribute. I guess that makes sense in a certain way (having equal bins for -10 to 10, 10 to 30, 30 to 50, etc.), but is also a bit weird.

[Dan Damelin]

Hi Jacob,

I tried to replicate this but didn’t see it. Am I setting things up differently than you did?

 

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[Jacob Sagrans]

This is what I did:

• This reply was modified 2 years ago by Jacob Sagrans.

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