[R] Problem with if statement

I am trying to use the value of an ID variable in an if statement and not getting the results I expected. # ID values for two school districts > with(rf, tapply(DistrictID, DistrictName, min) ) Aberdeen School Dist. # 58 Buhl Joint School District 59

[R] Capturing lagged values?

Consider a data structure where "header" rows supply ID values (school and grade in the example below) that are not captured in subsequent rows df <- read.table(textConnection(" school grade studentid score 101 5 NA NA NA NA 123 21 NA NA 124 25 201 6 NA NA NA NA 231 33"), header=TRUE) close

[R] R Solves Shakespeare Authorship Question

Those of you who track applications of R may be interested in the following: "The purpose of this paper is then to apply modern text analysis techniques using the R statistical packege [sic] to compare the works attributed to Shakespeare to those of leading alternate candidates such as Sir Frances

[R] Factor level with no cases shows up in a plot

Consider this data structure (df1) ... Group Year PctProf FullYr 1 Never RF 2004 87 88 2 Cohort 1 2004 83 84 3 Cohort 2 2004 84 86 4 Cohort 3 2004 87 87 5 Cohort 4 2004 73 74 6 Never RF 2005 85 86 7 Cohort 1 2005 81 82 8

[R] New York Times Article: Data Analysts Captivated by R's Power

Readers of this list might be interested in the following article in the New York Times and might find amusing the notion that "Some people familiar with R describe it as a supercharged version of Microsoft's Excel spreadsheet software...". http://www.nytimes.com/2009/01/07/technology/business-co