Combined Data Cleansing

Combined Data Cleansing

Combined Data Cleansing is located under Model Studio (  ) in Data Preparation, in the left task pane. Use the drag-and-drop method to use the algorithm in the canvas. Click the algorithm to view and select different properties for analysis.

Refer to Properties of Combined Data Cleansing.




Properties of Combined Data Cleansing

The properties of Combined Data Cleansing are as shown below.



The table below describes different fields present in the properties of Combined Data Cleansing.

Field

Description

Remark

RunIt allows you to run the node.-
ExploreIt allows you to explore the successfully executed node.-
Vertical Ellipse

The available options are

  • Run till node
  • Run from node
  • Publish as a model
  • Publish code
-

Task Name

It is the name of the task selected on the workbook canvas.

  • You can click the text field to edit or modify the task's name.
  • Space between words is not allowed in the Task Name.

Data Fields

It allows you to select the columns on which you want to apply the cleansing methods.

  • You can select multiple columns for data cleansing.
  • You can select a categorical or numerical column for data cleansing.

Cleansing Methods

It allows you to select the cleansing method to apply to the data fields.

  • Click to open a new window and select the appropriate method.
  • There are several methods, each containing multiple sub-methods for specialized cleansing of data.
  • You can select multiple methods. However, you can select only one sub-method from each method. For more information, read the table below.

Node Configuration

It allows you to select the instance of the AWS server to provide control over the execution of a task in a workbook or workflow.

For more details, refer to Worker Node Configuration.


The table below describes the various data cleansing methods and their corresponding sub-methods.

Method

Sub-Method

Description

Remove Unwanted Characters










Remove leading and trailing whitespaces

Remove any extra whitespace(s) before or after a string, word, or number.

Remove tabs, line breaks, and duplicate whitespaces

Remove any extra tabs, line breaks, or repeated whitespaces in a string.

Remove all whitespaces

Remove leading, trailing, in-between or duplicate whitespaces.

Remove letters

Remove alphabet(s) from a string or a number

Remove numbers

Remove a number(s) from strings or words

Remove punctuations

Remove all punctuation marks from strings, words, or numbers

Modify Case



Upper Case

Convert all letters or words in a string to upper case.

Lower Case

Convert all letters or words in a string to lower case.

Title Case

Capitalize each word in a phrase or a sentence.

Replace Null Data


Replace with blanks (string columns)

Replace any null string value in a cell with a blank space. It renders an empty cell.

Replace with zero (numeric columns)

Replace any null value in a numerical column with zero (0).

Remove Null Data




Remove Null Rows


Remove all rows with a null value in any column

Only remove rows that have a null value in every column

Remove Null Columns


Remove all columns with a null value in any row

Only remove columns that have a null value in every row


Note:

By default, the following values are interpreted as Not a Number (NaN):

  • '', '#N/A', '#N/A N/A', '#NA', '-1.#IND', '-1.#QNAN', '-NaN', '-nan', '1.#IND', '1.#QNAN', '<NA>', 'N/A', 'NA', 'NULL', 'NaN', 'n/a', 'nan', 'null'.

Example of Combined Data Cleansing

Consider a dataset with multiple irregularities present in various cells.
A snippet of the input data is shown below. The following irregularities are appropriately highlighted as shown.

  • Number and Strings with Special Characters
  • Empty Cells
  • Null Values in Columns
  • Line Break between Words
  • Leading and Trailing Whitespaces

We apply various Data Cleansing methods to the above data and explore the results. The following scenarios display the effect of the sub-methods.


Method 1: Remove Unwanted Characters

Sub-Method 1: Remove leading and trailing whitespaces

Applied on Column: Whitespace11



Similarly, you can use the Remove all whitespaces sub-method to remove leading, trailing, in-between, and duplicate whitespaces.

Sub-Method 2: Removing Line Break

Applied On Column: 1Item Type


 

Sub-Method 3: Removing letters

Applied On Column: Units Sold


Sub-Method 4: Removing numbers

Applied On Column: Country





Sub-Method 5: Removing punctuations

Applied On Column: Country


Method 2: Modify Case

Sub-Method 1: Upper Case

Applied to Column: Sales Channel


Sub-Method 2: Lower Case

Applied to Column: Sales Channel


 

Sub-Method 3: Title Case

Applied to Column: Whitespace11



Method 3: Replace Null Data

Sub-Method 1: Replace with blanks (string columns)

Applied to Column: Item Type





Sub-Method 2: Replace with zero (numeric columns)

Applied to Column: Order ID



Another snippet of input data shown below contains the following irregularities as appropriately labeled.

  • Rows/Columns with NaN Value
  • Empty Cells and Cells with Empty Spaces
  • Rows and Columns with all NaN and Empty values


We apply the Remove Null Data method to the above data and explore the results. The following scenarios display the effect of the sub-methods.

Method 4A: Remove Null Data (Remove Null Rows)

Sub-Method 1: Remove all rows with a null value in any column

Since all columns contain at least one null value, all the rows are deleted.


Sub-Method 2: Only remove rows that have a null value in every column

The original data contains fifteen rows of data. Out of these, the first two rows contain a null value in every column.
The image below shows that the first two rows are removed. Hence, only thirteen rows remain in the output.




Method 4B: Remove Null Data (Remove Null Columns)

Sub-Method 1: Remove all columns with a null value in any row

Since all rows contain at least one null value, all the columns are deleted.




Sub-Method 2: Only remove columns that have a null value in every row

In the original data, out of the nine columns containing data, four columns, namely NullString, NANSTRING, NullString1, and NANSTRING1 contain null values in every row. They also contain empty cells which are considered NaN values.
The image below shows that the above-mentioned four columns are removed. Hence, only five columns remain in the output.



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