Help System (web edition)

The following codes can be used in mask column 3 when a data file is
activated (by FILE ACTIVATE or FILE_ACT or MASK).

    -  no scale  (variable is cancelled in all statistical operations)
    D  Dichotomy (two distinct numeric values)
    N  Nominal
    O  Ordinal   (discrete)
    o  Ordinal   (continuous)
    S  Score     (discrete)
    s  Score     (continuous)
    I  Interval  (discrete)
    i  Interval  (continuous)
    R  Ratio     (discrete)
    r  Ratio     (continuous)
    F  Frequency

If scale type is omitted (code is blank), no scale control will
be performed and data is accepted in all applications.

The statistical operations observe scale types when desired. The
strictness of scale type control depends on the system parameter
scale_check in the system file SURVO.APU as follows:
     0   no control
     1   warning when a variable with insufficient scale is selected
     2   warning and interrupt of operation

Scale types can be given for variables in Survo data files only.

  S = More information on statistical operations