# tStem Enables to standardize data in columns before matching this data. tStem standardizes data in columns through the process of linguistic normalization, in which the variant forms of a word are reduced to a common form. This component is not shipped with your Talend Studio by default. You need to install it using the Feature Manager. For more information, see [Installing features using the Feature Manager](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/install-features-to-talend-studio). ## tStem Standard properties These properties are used to configure tStem running in the Standard Job framework. The Standard tStem component belongs to the Data Quality family. This component is available in Talend Data Management Platform, Talend Big Data Platform, Talend Real-Time Big Data Platform, Talend Data Services Platform and in Talend Data Fabric. ## Basic settings | Properties | Description | | --- | --- | | Schema and
Edit schema |

A schema is a row description, it defines the number of fields to be processed and passed on to the next component. The schema is either Built-in or stored remotely in the Repository.
Built-in: You create the schema and store it locally for this component only. For more information about a component schema in its Basic settings tab, see Basic settings tab.
Repository: You have already created the schema and stored it in the Repository. You can reuse it in various projects and Job designs. For more information about a component schema in its Basic settings tab, see Basic settings tab.

| | Select Algorithm | Set a stemming algorithm for each analyzed
column of the type
*string*.

Column: list of
the analyzed column.

Algorithm: Select
from the list the algorithm language you want to
check the column data against. | ## Advanced settings | Properties | Description | | --- | --- | | tStatCatcher
Statistics | Select this check box to collect log data at
the component level. | ## Global Variables | Variables | Description | | --- | --- | | Global
Variables | ERROR\_MESSAGE: the error message generated by the
component when an error occurs. This is an After variable and it returns a string. This
variable functions only if the Die on error checkbox is
cleared, if the component has this checkbox.

A Flow variable functions during the execution of a component
while an After variable functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl+Space to access the variable list and choose the variable to use from
it.

For more information about variables, see [Using contexts and variables](https://help.qlik.com/talend/r/en-US/8.0/studio-user-guide/contexts-and-variables). | ## Usage | Usage guidance | Description | | --- | --- | | **Usage rule** | This component is an intermediary step. It
requires an input flow as well as an
output. | **Related concepts** * [Extracting the stems of English words from a specific DB column](https://help.qlik.com/talend/en-US/components/8.0/text-standardization/tstem-tfilterrow-taggregaterow-tfileoutputexcel-extracting-stems-of-english-words-from-specific-db-column-standard-component-enterprise-this) * [Generating stems for a list of English words](https://help.qlik.com/talend/en-US/components/8.0/text-standardization/tstem-tmap-tfileinputdelimited-tlogrow-generating-stems-for-list-of-english-words-standard-component-enterprise-this)