Re: [R] Aggregation across two variables in data.table

2017-12-14 Thread PIKAL Petr
ay, December 14, 2017 8:48 AM > To: r-help@r-project.org > Cc: Michael Haenlein > Subject: [R] Aggregation across two variables in data.table > > Dear all, > > I have a data.frame that includes a series of demographic variables for a > set of respondents plus a dependent va

[R] Aggregation across two variables in data.table

2017-12-13 Thread Michael Haenlein
Dear all, I have a data.frame that includes a series of demographic variables for a set of respondents plus a dependent variable (Theta). For example: AgeEducation Marital Familysize IncomeHousingTheta 1: 50 Ass