> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fincept.in/llms.txt
> Use this file to discover all available pages before exploring further.

# Winsorization

> Clips extreme values to specified percentiles to reduce outlier impact while preserving data points. Less aggressive than outlier removal. Common in financial data preprocessing. [Tier: ENTERPRISE, Credits: 10]



## OpenAPI

````yaml api-specs/ml.json post /quantlib/ml/preprocessing/winsorize
openapi: 3.1.0
info:
  title: FinceptQuantLib API - ML
  description: >-
    Machine Learning and Credit Risk module endpoints for FinceptQuantLib API.
    Pro Tier access required (5 credits per request). Covers credit scoring,
    model validation, regression models, clustering, anomaly detection, feature
    engineering, and preprocessing.
  version: 3.0.0
  contact:
    name: Fincept API Support
    url: https://fincept.in
servers:
  - url: https://api.fincept.in
    description: Fincept API Production Server
security:
  - APIKeyHeader: []
tags:
  - name: quantlib-ml
    description: Machine Learning and Credit Risk Analytics
    x-displayName: ML
paths:
  /quantlib/ml/preprocessing/winsorize:
    post:
      tags:
        - quantlib-ml
      summary: Winsorization
      description: >-
        Clips extreme values to specified percentiles to reduce outlier impact
        while preserving data points. Less aggressive than outlier removal.
        Common in financial data preprocessing. [Tier: ENTERPRISE, Credits: 10]
      operationId: winsorize
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - data
              properties:
                data:
                  type: array
                  description: Data to winsorize
                  items:
                    type: number
                  example:
                    - 1.2
                    - 1.5
                    - 1.3
                    - 10
                    - 1.4
                    - 1.6
                    - 0.1
                lower:
                  type: number
                  description: Lower percentile bound (0-1)
                  default: 0.05
                  example: 0.05
                upper:
                  type: number
                  description: Upper percentile bound (0-1)
                  default: 0.95
                  example: 0.95
      responses:
        '200':
          description: Winsorized data
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                    example: true
                  data:
                    type: object
                    properties:
                      winsorized:
                        type: array
                        items:
                          type: number
                        description: Winsorized data with clipped extremes
                        example:
                          - 1.2
                          - 1.5
                          - 1.3
                          - 1.6
                          - 1.4
                          - 1.6
                          - 1.2
        '401':
          $ref: '#/components/responses/UnauthorizedError'
        '402':
          $ref: '#/components/responses/InsufficientCreditsError'
        '422':
          $ref: '#/components/responses/ValidationError'
components:
  responses:
    UnauthorizedError:
      description: Authentication information is missing or invalid
      content:
        application/json:
          schema:
            type: object
            properties:
              detail:
                type: string
                example: Invalid API key
    InsufficientCreditsError:
      description: Insufficient credits for this operation
      content:
        application/json:
          schema:
            type: object
            properties:
              detail:
                type: string
                example: Insufficient credits. This endpoint requires 5 credits.
    ValidationError:
      description: Request validation error
      content:
        application/json:
          schema:
            type: object
            properties:
              detail:
                type: array
                items:
                  type: object
                  properties:
                    loc:
                      type: array
                      items:
                        type: string
                    msg:
                      type: string
                    type:
                      type: string
  securitySchemes:
    APIKeyHeader:
      type: apiKey
      in: header
      name: X-API-Key
      description: >-
        API key for authentication. Get your key at
        https://api.fincept.in/auth/register

````