[R] Error in -c(intcol, respcol) : invalid argument to unary operator

alid argument to unary operator. It seems as though the negative 1 values are problematic but the FrF2 instructions insist on neg1 and plus1 values. Does anyone know what I should do to overcome this please. Many thanks scriptham -- View this message in context: http://www.nabble.com/Erro

[R] Calculate Range

different term for range in tapply? I have also tried aggregate() with Fun=range, with Fun=min and FUN=max and they also gave problems. What is the best route to calculate ranges for groups within a data frame. Thanks. Scriptham. -- View this message in context: http://r.789695.n4.nabble.com