topic Re: counting rows based on values in another column in Discussions

counting rows based on values in another column

dwaterson — Thu, 02 Apr 2015 17:09:20 GMT

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'.

Re: counting rows based on values in another column

vince_faller — Fri, 03 Apr 2015 17:37:40 GMT

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());

Re: counting rows based on values in another column

pmroz — Fri, 03 Apr 2015 18:11:19 GMT

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]

Re: counting rows based on values in another column

dwaterson — Thu, 09 Apr 2015 14:56:19 GMT

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

Re: counting rows based on values in another column

ms — Thu, 09 Apr 2015 15:14:42 GMT

Col Number(Row(), :Gender)

Re: counting rows based on values in another column

Anonymous — Sat, 09 Jan 2016 02:04:00 GMT

Thanks! This helped me out.