[R] data frame to frequencies

I have a data frame that has columns Semester, Student ID (SID), Subject, Grade, Devel (Tor F). Students can have multiple records within a semester. Right now, the columns are not considered factors. I want to do an analysis that would show the number of students who received particular combinat

[R] categorical analysis - grouping rows

I apologize up front if this has been covered elsewhere - but I can't find any such question. I have a data set that contains academic data: term (i.e., semester), student id, dept, class, success (1=Y, 0=N) I want to look at dept by term to determine descriptive statistics for success to failure

[R] simple user input

I'd like to provide a simple user capability of choosing some parameters that I could grab to generate a graph. User would be selecting choices via radio buttons etc via a web browser. I work in a Windows environment. Does anyone have sample code? -- View this message in context: http://r.789695.