topic Calculating Col Quantile by columns in Discussions

Calculating Col Quantile by columns

Steve_Kim — Tue, 18 Oct 2016 22:22:39 GMT

Hi~

I'd like to calculate Col Quantile by Columns

on the data table

by using JMP formula as below. (Note. Not from 'Tabulate' menu)

Do you have any idea with this?

Thanks in advance. : )

Re: Calculating Col Quantile by columns

michael_jmp — Sat, 18 Apr 2020 19:38:18 GMT

Unfortunately, the Col Quantile function does not support a By variable. However, you can use the following formulas to get around this limitation:

//Examples using $SAMPLE_DATA/Big Class.jmp:

//When By variable is character-valued:
Quantile( 0.25, (:height << get values)[loc((:sex << get values),"M")] )

//When By variable is numeric-valued:
Quantile( 0.25, (:height << get values)[loc((:age << get values) == :age)] )

Hopefully, one of these two will work for your situation!

Michael

Re: Calculating Col Quantile by columns

brady_brady — Sat, 18 Apr 2020 19:38:37 GMT

Using Michael's approach, you can also do the following for the character-valued scenario, to avoid having to list each group value explicitly:

Quantile(
0.25,
  (:height << get values)[Loc( :age << get values, :age[Row()] )]
)

If you need to use more than one grouping variable (say, 3 columns together, for instance) you would first concatenate the columns together to form a fourth, and use this new column as a (single) grouping column.

Cheers,

Brady

Re: Calculating Col Quantile by columns

michael_jmp — Sat, 18 Apr 2020 19:37:54 GMT

Brady,

Thanks for catching my typo! I meant for the character-valued case to be this:

//When By variable is character-valued:
Quantile( 0.25, (:height << get values)[loc((:sex << get values),:sex)] )

Best,

Michael

Re: Calculating Col Quantile by columns

Steve_Kim — Thu, 22 Jan 2015 00:58:38 GMT

WOW!!!!

It's marvelous solution!

and I learned 'get values' and 'location' formula from you.

Thank you so much Michael and Brady!