Parameters | Spectral Preprocessing | By Variable

By Variable
Specify a variable by which to perform separate binning and smoothing. This variable typically indexes the samples in your experiment. Unique values of this variable form the column names in the output data set. The default By Variable is ColumnName.
BY Variables
BY variables are optional (in most processes) variable specifications whose values define groups of observations, such as hour, month, or year. BY variables can enable analyses to be performed separately on different groups as defined by that variable. Choosing a BY variable such as Mass, for example, groups the observations by mass and conducts separate analyses at each value of mass.
Alternatively, specifying a BY variable enables you to animate an image so that you can see how response values change according to some grouping, like over time.
To Specify a By Variable:
The Available Variables field becomes populated with variables from the specified data set.
Left-click a variable in the Available Variables field.