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diggingnumbers:transforming_variables

Transforming variables

To group the variable Date into a new variable Period:

> Period <- Date
> Period[(Date>650)&(Date<=1200)] <- 1
> Period[(Date>100)&(Date<=650)] <- 2
> Period[(Date<=100)] <- 3
> table(Period)
Period
 1  2  3 
20 18  2 
> barplot(table(Period))
> barplot(table(Mat,Period), beside=TRUE)

To create the new variable “maximum length / maximum width ratio”, Lewirat:

> Lewirat <- Maxle/Maxwi

To create the new variable “socket length as percentage of maximum length”, Socperc:

> Socperc <- (Socle/Maxle)*100

Start · Data description · Transforming variables · Tables · Pictorial displays · Measures of position and variability · Sampling · Tests of difference · Tests of distribution · Correlation · Tests of association

diggingnumbers/transforming_variables.txt · Last modified: 2012/11/30 09:58 (external edit)