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This step checks each row of the input column to determine if the value is missing (null or NaN). The result is a new boolean column, where each row indicates whether the corresponding element in the input column is missing. The step can work with single-valued and multi-valued columns, and the output can be configured to be either boolean (true/false), numeric (0/1) or categorical (custom labels).
  • For single-valued columns: Each row in the output column will be true if the corresponding value in the input column is missing, and false otherwise.
  • For multivalued columns: Each row in the output column will be true if the corresponding sub-list in the input column is empty, and false otherwise.

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Usage

The following examples show how the step can be used in a recipe.

Examples

Check for missing values in a numeric column.
is_missing(ds.numeric_col) -> (ds.numeric_col_missing)

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Inputs & Outputs

The following are the inputs expected by the step and the outputs it produces. These are generally columns (ds.first_name), datasets (ds or ds[["first_name", "last_name"]]) or models (referenced by name e.g. "churn-clf").
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column
column
required
The input column to check for missing values.
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result
column
required
The output column indicating the presence of missing values in the input column.

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Configuration

The following parameters can be used to configure the behaviour of the step by including them in a json object as the last “input” to the step, i.e. step(..., {"param": "value", ...}) -> (output).

Parameters

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out_type
string
default:"boolean"
Output type. The data type of the output column.
  • ‘boolean’: Output is true/false indicating missing or not.
  • ‘number’: Output is 0/1 indicating missing or not.
  • ‘category’: Output is specified by params[“labels”][“true”] and params[“labels”][“false”].
Values must be one of the following:
  • boolean
  • number
  • category
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labels
object
Labels for the true and false categories. An object mapping the “true” and “false” categories to custom labels.
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true
string
default:"true"
Label for the “true” category.
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false
string
default:"false"
Label for the “false” category.