topic Re: create a formula that takes means over different variables in Discussions

create a formula that takes means over different variables

lauren_eggett — Tue, 03 Mar 2015 19:14:29 GMT

I have a bunch of categorical factors (like gender, age group, etc.) and a continuous response. I'd like to take the means of the response but grouped for the categorical factors. So any woman between the ages of 15 and 20, say, would be averaged separately from men 60-65. And I would like these means saved to a column. Is there a way to do that? Sorry, if this is an easy answer...I'm very new to jmp.

Re: create a formula that takes means over different variables

Craige_Hales — Tue, 18 Oct 2016 22:45:10 GMT

start with Tables->Summary, which will produce a new table. If you like what you get, there is a Source script (red triangle) you can use in JSL.

Re: create a formula that takes means over different variables

lauren_eggett — Tue, 03 Mar 2015 20:45:20 GMT

I can use that to get my means but I don't know how to take that information and put it back into my original data table as a column. I have over 4k rows so manually entering the means is not possible.

Re: create a formula that takes means over different variables

Kevin_Anderson — Tue, 03 Mar 2015 21:03:47 GMT

Hi, Lauren. Everyone was new to JMP at one time...

Go to Table -> Join and join the new table with the original by matching the AGE column.

Re: create a formula that takes means over different variables

Craige_Hales — Tue, 03 Mar 2015 21:08:29 GMT

Tables->Join does the job of matching up the rows from the short and long tables, using a column you specify to match them. Again, there will be a script in the joined table if you need it for JSL.

Re: create a formula that takes means over different variables

ms — Tue, 03 Mar 2015 21:37:34 GMT

If you want the means in your original table a column formula may be a better option, especially if your data will change.

Add a new column with a formula like

Col Mean(:height, :sex, :age)

where :height is the continuos response and :sex and :age represent optional grouping columns.

Re: create a formula that takes means over different variables

Craige_Hales — Tue, 03 Mar 2015 21:39:25 GMT

way better

Re: create a formula that takes means over different variables

lauren_eggett — Wed, 04 Mar 2015 16:31:48 GMT

Thank you! That was very easy.

Re: create a formula that takes means over different variables

Jeff_Perkinson — Sun, 08 Mar 2015 15:57:13 GMT

Here's a neat, hidden trick in JMP – you can drag a column from a summary table back to the source table to auto-join it. Just remember to pause for a beat after clicking at the top of the summary column.

-Jeff