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How to get a formula column by row sub group

Thomas1

Hi there,

I d like to create a formula column (sum or mean etc.) with sub groups. The sub groups should be selected by rows, for example all 5 following rows drom a data table or in general all N rows. Any ideas to solve this with row()?

Attache a file to add the formula column.

RowFormula.jmp

Accepted answers

Not sure why you see this error message. You could try updating to the latest version to see if it helps. But, you could hard code the value of n to avoid the variable in the formula if the number is constant.

Or try with Local() instead of Parameter() (which actually is what I intended in my first post).

Local({n = 5}, Col Sum(:Data, Ceiling(Row() / n)))

All comments

txnelson

The Col Moving Average() function is what you need to use.

For your averaging the formula would be:

Col Moving Average( :Data, 1, 0, 5 )

To calculate the sum it would be

Col Moving Average( :Data, 1, 0, 5 ) * 6

Documentation on the function is found in the Scripting Index

Help==>Scripting Index

look for Statistical Functions

Thomas1

Hi Jim,

Thanks for your fast response. Actually I'm looking for column formulas for row sub groups (for example row1 1-5, row1 6-10 ..., in general row 1-n, row n+1 - 2n, row 2n+1 - 3n...), where I can apply the column formulas from JMP.

txnelson

That is a bit confusing......could you provide a sample table?

Try using a Row() transformation as optional ByGroup argument of the "Col Stat()" functions.

For example:

Parameter({n = 5}, Col Sum(:Data, Ceiling(Row() / n)))

Thomas1

Attached a sample file with a new column "Sum_of_each_5_Data_rows". This shows the sum of sub groups build from every 5 rows (N=5) of the data column.

How could this be done by using any given row numbers for the subgroup to create column formulas like Col Sum, Col Mean, Col Min etc.

RowFormula1.jmp

Thomas1

Hi ms,

Thanks for your support. Your formula works great. Despite the formula delviers the approriate reuslts, the formal editor is marking n red in the formul part:

( Row() / n ) ) )

and delievers an error code. The error code is "Error: Name Unresolved: n". Are there any reasons to be concerned?