Home > Using the Oracle Data Miner... > Oracle Data Miner Functiona... > View Menu > Tools Menu > Data Miner Preferences > Filter Columns
The preferences specify the behavior of the Filter Columns transformation. You can specify the following Data Quality criteria:
% Nulls less than or equal: Indicates the largest acceptable percentage of NULL values in a column of the data source. The default value is 95%.
% Unique less than or equal: Indicates the largest acceptable percentage of values that are unique to a column of the data source. The default value is 95%.
% Constant less than or equal: Indicates the largest acceptable percentage of constant values in a column of the data source.
Attribute Importance is not selected by default. You can specify these settings:
Importance Cutoff: A number between 0 and 1.0. The default cutoff is 0.
Top N: The maximum number of attributes. The default is 100.
The column filter by default uses sampling to determine data quality and attribute importance. The default is to use a sample size of 2000 records. You can turn off sampling, that is use all of the data, or increase the sample size.