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Sep 16, 2015 4:08 PM
(3122 views)

Greetings,

If I have the following sample data:

ID 1 Date 1

ID 1 Date 2

ID 1 Date 3

ID 2 Date 4

ID 2 Date 5

ID 2 Date 6

ID 2 Date 7

ID 3 Date 8

ID 3 Date 9

ID 3 Date 10

ID 3 Date 11

ID 3 Date 12

For a given row (aka unique ID and Date pair), how to create a new column to indicate this row is Date number X (of Y rows for each unique ID)?

ID 1 Date 1 1

ID 1 Date 2 2

ID 1 Date 3 3

ID 2 Date 4 1

ID 2 Date 5 2

ID 2 Date 6 3

ID 2 Date 7 4

ID 3 Date 8 1

ID 3 Date 9 2

ID 3 Date 10 3

ID 3 Date 11 4

ID 3 Date 12 5

For this small sample set, I can easily do manually. However, I do not know how to write a script using available JMP/jsl functions to compared between rows to do this for a large data set.

Thank you.

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Sep 17, 2015 8:47 AM
(5578 views)

Solution

You could also use one of these formulas, **after using sort by (ID, Date).** One formulas counts the number of times there is a date (any date) for a given ID, the second one counts the number of times there is a **new** date for a given ID (see rows 12 to 14 in screenshot).

If(Row() == 1, 1, If(:ID[Row() - 1,Empty()] == :ID, :Date# for that ID[Row() - 1,Empty()] + 1, If(:ID[Row() - 1,Empty()] != :ID, 1, Empty())))

If(Row() == 1, 1, If(:ID[Row() - 1,Empty()] == :ID, If(:Date[Row() - 1,Empty()] != :Date, :Unique Date# for that ID[Row() - 1,Empty()] + 1, :Unique Date# for that ID[Row() - 1,Empty()]), If(:ID[Row() - 1,Empty()] != :ID, 1, Empty())))

5 REPLIES

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Sep 16, 2015 5:26 PM
(2885 views)

There are several ways to do this. For example, copy the code below and paste it into the formula property of a new column. It's supposed to return the number of all instances of an ID up to the current row (the ID column is assumed to be named "ID").

Eval**(**Eval Expr**(**Col Sum**(**Row**()** <= Expr**(**Row**())**, :ID**)))**

For very big data tables there are probably faster approaches.

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Sep 18, 2015 1:54 PM
(2885 views)

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Sep 17, 2015 8:47 AM
(5579 views)

You could also use one of these formulas, **after using sort by (ID, Date).** One formulas counts the number of times there is a date (any date) for a given ID, the second one counts the number of times there is a **new** date for a given ID (see rows 12 to 14 in screenshot).

If(Row() == 1, 1, If(:ID[Row() - 1,Empty()] == :ID, :Date# for that ID[Row() - 1,Empty()] + 1, If(:ID[Row() - 1,Empty()] != :ID, 1, Empty())))

If(Row() == 1, 1, If(:ID[Row() - 1,Empty()] == :ID, If(:Date[Row() - 1,Empty()] != :Date, :Unique Date# for that ID[Row() - 1,Empty()] + 1, :Unique Date# for that ID[Row() - 1,Empty()]), If(:ID[Row() - 1,Empty()] != :ID, 1, Empty())))

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Sep 18, 2015 1:53 PM
(2885 views)

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Sep 18, 2015 2:16 PM
(2885 views)

For large datasets you might try the following; assuming the first column is sorted as in your example, the expression below will work as a formula in a new column. It takes my machine about 2 seconds on a 1M row dataset.

(Row() - Col Min( Row(), :ID )) + 1

Cheers,

Brady