Greetings useRs, What is the easiest way to create a design matrix of several factor variables? Function gendata in Design seems to do that for a fitted model, but how to do that only on several factor vectors?? The result should be a df with one row for each distinct combination of levels of factors eg for (M,F) (Y,O) We get M Y M O F Y F O In reality I will have more than 1000 rows so doing by hand not good. Maybe there is a way with "outer", but I couldn't see it. All the best to everybody. Stephen
Create design matrix
3 messages · Bond, Stephen, Justin Haynes, Bert Gunter
?expand.grid
expand.grid(c("M","F"),c("Y","O"))
Var1 Var2 1 M Y 2 F Y 3 M O 4 F O
Justin
On Thu, Nov 3, 2011 at 10:56 AM, Bond, Stephen <Stephen.Bond at cibc.com> wrote:
Greetings useRs, What is the easiest way to create a design matrix of several factor variables? Function gendata in Design seems to do that for a fitted model, but how to do that only on several factor vectors?? The result should be a df with one row for each distinct combination of levels of factors eg for (M,F) (Y,O) We get M Y M O F Y F O In reality I will have more than 1000 rows so doing by hand not good. Maybe there is a way with "outer", but I couldn't see it. All the best to everybody. Stephen
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