Missing Value (deprecated)

This node helps handle missing values found in cells of the input table. The first tab in the dialog (labeled "Default") provides default handling options for all columns of a given type (i.e. Double, String, Integer, and all other unknown column types). These settings apply to all columns in the input table that are not explicitly mentioned in the second tab, labeled "Individual". This second tab permits individual settings for each available column (thus, overriding the default). To make use of this second approach, select a column which needs extra handling, click "add", and set the parameters. To remove this extra handling (and instead use the default handling), click the "remove" button for this column. The possible options are summarized below:

Options

Do nothing

The missing values are retained, i.e. those missing cells are not touched and will occur - as they are - in the output table. This option is available for all column types.

Remove row

Any row that contains a missing value for this type, will be completely removed and will not be contained in the output table. This option is available for all column types.

Min, Max, or Mean

Missing values are replaced by either min, max, or the mean value in this column. This option is only available for numeric column types, i.e. Double or Integer. The Mean for integer columns is rounded.

Most Frequent

This option is available for string and integer columns and replaces any occurrence of a missing value with the most frequent value in a column. If two (or more) different values occur equally often, the first value being encountered is used. If a column contains only missing values, the column stays untouched (containing only missing values in the output table).

Fix Value

Replaces the missing values with a static value set by the user. This option is available for Double, Integer, and String columns.

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