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- counting rows based on values in another column

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Apr 2, 2015 10:09 AM
(6398 views)

I have a column that defines a grouping, like a column called 'gender' that contains the values 'male' and 'female'. I want to know how many rows in the dataset = 'male' and how many rows in the dataset = 'female'.

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dt = current data table();

dt << Select Where(:Gender == "male");

male = nrows(dt << Get Selected rows());

dt << Select Where(:Gender == "female");

female = nrows(dt << Get Selected rows());

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Apr 3, 2015 11:11 AM
(8491 views)
| Posted in reply to message from vince_faller 04/03/2015 01:37 PM

You can use **Tables > Summary**. Here's a JSL version:

dt = open**(**"$sample_data/Big Class.jmp"**)**;

dt << **Summary(** Group**(** :sex **)**, N **);**

There's also the SUMMARIZE command in JSL. You need a numeric column to get this to work though:

summarize**(**gsex = by**(**:sex**)**, gcount = count**(**:height**))**;

print**(**gcount**)**;

**[18, 22]**

5 REPLIES 5

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dt = current data table();

dt << Select Where(:Gender == "male");

male = nrows(dt << Get Selected rows());

dt << Select Where(:Gender == "female");

female = nrows(dt << Get Selected rows());

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Apr 3, 2015 11:11 AM
(8492 views)
| Posted in reply to message from vince_faller 04/03/2015 01:37 PM

You can use **Tables > Summary**. Here's a JSL version:

dt = open**(**"$sample_data/Big Class.jmp"**)**;

dt << **Summary(** Group**(** :sex **)**, N **);**

There's also the SUMMARIZE command in JSL. You need a numeric column to get this to work though:

summarize**(**gsex = by**(**:sex**)**, gcount = count**(**:height**))**;

print**(**gcount**)**;

**[18, 22]**

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Re: counting rows based on values in another column

Thank you for these responses. Is there any way to do this within a column formula?

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Re: counting rows based on values in another column

Col Number(Row(), :Gender)

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Re: counting rows based on values in another column

Thanks! This helped me out.