Create bucket - Number

Create buckets - Number


The bucketing transformation groups values in multiple ranges or buckets for easier understanding of highly scaled data. The granular details of such data can prevent us from getting a broad view of the data. This form of grouping values in a range not only helps in observing the overall view of the data, but also in finding data patterns.  

Bucketing works on the top of the base data types: Number, Text, and Date. 

To find bucketing operation:
  1. Right-click the column in the Studio page. 
  2. Select Create Buckets option from the context menu. 

Bucketing in a number column

Buckets can be formed in two ways in a numeric column: Automatic and Manual .  

Automatic bucketing

Automatic bucketing creates buckets based on the column data pattern and the number of buckets required.
You can edit this value under the Number of buckets option. By default, the automatic bucketing option creates ten buckets.

To apply Automatic bucketing in a column:  
  1. Right-click the column in the Studio  page .  
  2. Select Create Buckets option from the context menu.  
  3. Give a name to your new column under Base column name. 
  4. In the Transform panel, the  Automatic    option In the Operations panel, the  Automatic   option is selected by default.  
  5. By default, the value for Number of buckets is ten. You can edit the value as per your requirement. 
  6. The auto bucketing option groups each value by taking the lowest and the highest values from the column, and divides it by the number of buckets chosen. 
  7. Preview of the resultant column is shown in the data grid.
  8. Click Apply


Manual bucketing 

Manual bucketing requires input from the user, such as the range values and associated conditions. 
To apply Manual bucketing in a column:  
  1. Right-click the column in the Studio page. 
  2. Select the Create Buckets option from the context menu. 
  3. In the Transform   panel, the option Automatic is selected by default. Choose the  Manual option .
  4. Select one of the bucketing methods. 
    1. Fixed intervals
    2. Custom range
    3. Specific values
  5. Give a name to your new column under Base column name
  6. Enter the conditions, interval size, and labels as required for the selected bucketing method. 
  7. A preview of the resultant column will be shown in the data grid.
  8. Click Apply .  

Fixed intervals 

You can input the interval size using the Fixed intervals option. 
  1. For example, if the selected numerical column has data between 0 to 100, and the interval size is given as 10, the created range of intervals i.e. bucket values will be 0-9, 10-19, 20-29, and so on till 90-99. 
  1. In the newly created column, the bucket values are placed against each value in the selected numerical column that fits in a particular interval.  
  1. If a numerical column has some invalid data such as text or date values, then the resultant column will have 'NA'. 




Custom range

Using the Custom range, you can input the conditions to determine bucket labels. 
For example, if the numerical column has age data between 0 to 100, you can input the conditions in such a way that more than 0 and less than 13 falls under the bucket label "Child", equal to or more than 13, and less than 19 falls under the label "Teens", more than 19 and less than 60 falls under the label "Adults", and finally, greater than 60 will fall under the label "Senior citizens". 

This is accomplished by providing conditions using these comparative operators:

  1. Equal to (=), More than (>), More than or equal to (>=), as part of the Start condition , and
  2. Less than (<), Less than or equal to (<=), as part of the End condition

If the selected column has values that won't fit in any condition, it is marked with a separate label 'NA'.
You can edit this label under the Label for unmatched values option. 

Use the + button to add another condition below the current one, or the - button to delete the current condition. 

In the newly created column, the buckets are placed against each value in the selected numerical column that fits in a particular range.



Specific values

Using the Specific values option, you can enter specific values from the selected numerical column and label them as a bucket. 

For example, if the selected numeric column is "Item code", you can create a new column "Category", and define the condition such that the item codes 101 and 102 fall under the bucket "Books", 200 and 202 fall under the bucket "Magazines", and 300 and 301 fall under the bucket "Pens". You can leave the default label for unmatched values as NA.  

The values that were selected inside the "in" conditions will have the appropriate label defined in the new column. The ones that do not match the condition will have the default value: NA. 

Item
Item code
Category
 
 Gandhi's Biography
 101
 Books
 
 Parker Frontier Stainless Steel   Roller Ball

 301
  Pens
 
 Startup city India



 202
 Magazines
 
 Murder on the Orient express

 102
 Books
 
 Pens  Coca-cola

 789
 N/A




To apply filters

If you want to apply some filters along with this transform, you can use the filters functionality.

1. Click the  Filters  tab.

2. Click the   icon and add the required columns in the  Filters  section. You can also reorder the filters using the drag and drop method.




3. For every column added, you can select one of the following options from the drop-down:
  1. Actual: This option lets you filter rows based on the actual values in the column. Click  here  to know more.
  2. Data quality: This option lets you filter rows based on the quality of data in the column. Click  here  to know more.
  3. Patterns: This option helps you filter rows based on the data patterns in the selected column. Click  here  to know more.
  4. Outliers: This option allows you to filter rows based on the outliers present in the data of the selected column. Click  here  to know more. 
Note: The filter options are displayed based on the datatype of the column added for the filter.

4. When you add more than one filter to the  Filters  section, the logical operators, AND or OR appear next to the filters. You can click to toggle the logical operator between AND and OR.
  1. Using the logical operators, you can combine the conditions and apply logic to determine the rule of precedence. The final expression is displayed in the  Criteria expression  box. You can click  Edit  to alter the default expression using logical operators and parenthesis to specify the precedence or the sequential order as to which condition should be evaluated first. Click  Save  after making the required changes. 
  1. For example, In the expression, ((1 OR 2) AND (3 OR 4)) , at first the condition ( 1 OR 2 ) will be executed and the condition ( 3 OR 4 ) will be executed next. Thirdly, since, the AND operator is used, the filter will be applied when both the conditions are true.
5. You can further drill down to choose specific values based on the filter option selected for each filter, in the next section.



For example, in the above screenshot, the  Data quality  option is selected for the All columns filter in the  Filters  section. Based on the selection, further options to filter specific values are displayed in the  All columns (Data quality)  section.

6. You can choose to include or exclude the selected items in the last section.

7. If you want to remove all the filters for some reason, you can use the  Clear  button.

8. A live preview of the filter transform is shown as you make changes. 

9. Click the  Apply  button to apply the transform along with the filters.

SEE ALSO



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