Stresser

Produces stress for the given values. Each cell is stressed individually with the given percentages of stress. There are four kinds of stress, based on the column type.

String columns can be stressed by switching the string value to another value inside the given column domain. Otherwise they can be stressed by exchanging two letters.

Number values can be stressed inside or outside the input range.

Options

Percentage to stress per row

The percentage to stress per row. Rows are selected based on this probability. Set to 0.01 to stress approximately 1% of rows.

Percentage to stress per column

The percentage to stress a column with. If a row was selected to be stressed, this algorithm chooses which cells should be stressed based on this value. If all columns in the stressed row should be changed, set the value to 1.0. The probability a cell is stressed is the multiplication of both the row and column stress probabilities.

String

The type of string stressing applied to all selected string columns.

Switch class: Exchanges the string value with another value from the column domain.
Mutate: Exchanges two letters within the string.

Number

The type of number stressing applied to all selected number columns.

Out of range: Creates stress values outside the current column range.
In range: Creates stress values within the current column range.

Use fixed seed

When enabled, the stressing will use a fixed seed value, making the randomization reproducible across multiple executions. When disabled, each execution will produce different random stressing results.

Random seed

The seed value used for random number generation. Use the same seed to get identical stressing results across multiple executions. You can enter a custom value or use the random seed generation button below.

Draw seed

Generate a random seed and set it in the Random seed input above for reproducible runs.

Always include all columns

If checked, node behaves as if all columns were moved to the "Include" list.

Stressed columns

Move the columns to be stressed into the "Include" list. Only columns with domain information (numeric columns with min/max bounds or string columns with domain values) can be stressed.

Input Ports

: Arbitrary input data.

Output Ports

: Input data with some stressed values.
: Containing only changed values. Unchanged values in rows which changed will set as missing values.

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Installation

To use this node in KNIME, install the extension KNIME Data Generation from the below update site following our NodePit Product and Node Installation Guide:

v5.9

A zipped version of the software site can be downloaded here.

Plugin provider: KNIME AG, Zurich, Switzerland

Plugin version: 5.9.0.v202511132127

On NodePit since: 2025-12-11

Last update: 2026-01-06

Tags: Modern UI

KNIME versions: Since v3.6

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