# Using Cost or Frequency Columns

main topics

In a parametric analysis, the frequency column
represents the total frequency of failures (or number of repairs) at the
time listed in the time column.

· If
data are exact, it is not theoretically possible to have multiple failures
at any one instant for a given system. However, you may need a frequency
column because of rounding error that occurred during data collection.

· With
interval data, the frequency column indicates the number of failures that
have occurred within the corresponding intervals.

In a nonparametric analysis, you can use the column representing the
cost/total number of repairs in different ways:

· Total
frequency of failures (or number of repairs) at the time listed in the
time column

· Cost
of each repair

Note |
If you do not provide a cost or frequency column, Minitab
assumes a cost or frequency of 1 for all failures. |