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MLS-C01 · Question #346

A developer at a retail company is creating a daily demand forecasting model. The company stores the historical hourly demand data in an Amazon S3 bucket. However, the historical data does not…

The correct answer is C. Use Amazon SageMaker Data Wrangler. Import the data from Amazon S3. Resample data by. To prepare irregular hourly demand data for an ARIMA model and verify its suitability, the data must be transformed into a consistent, complete time series.

Modeling

Question

A developer at a retail company is creating a daily demand forecasting model. The company stores the historical hourly demand data in an Amazon S3 bucket. However, the historical data does not include demand data for some hours. The developer wants to verify that an autoregressive integrated moving average (ARIMA) approach will be a suitable model for the use case. How should the developer verify the suitability of an ARIMA approach?

Options

  • AUse Amazon SageMaker Data Wrangler. Import the data from Amazon S3. Impute hourly missing
  • BUse Amazon SageMaker Autopilot. Create a new experiment that specifies the S3 data location.
  • CUse Amazon SageMaker Data Wrangler. Import the data from Amazon S3. Resample data by
  • DUse Amazon SageMaker Autopilot. Create a new experiment that specifies the S3 data location.

How the community answered

(55 responses)
  • A
    7% (4)
  • B
    4% (2)
  • C
    76% (42)
  • D
    13% (7)

Why each option

To prepare irregular hourly demand data for an ARIMA model and verify its suitability, the data must be transformed into a consistent, complete time series.

AUse Amazon SageMaker Data Wrangler. Import the data from Amazon S3. Impute hourly missing

While imputing missing values is important, option C is more comprehensive by explicitly including 'Resample data by hour' first, which is critical for establishing a consistent hourly frequency for time series analysis like ARIMA.

BUse Amazon SageMaker Autopilot. Create a new experiment that specifies the S3 data location.

Amazon SageMaker Autopilot automates model building and tuning, but it doesn't primarily focus on the explicit data preparation steps like resampling and imputation needed to *verify suitability of an ARIMA approach* based on data regularity issues.

CUse Amazon SageMaker Data Wrangler. Import the data from Amazon S3. Resample data byCorrect

Amazon SageMaker Data Wrangler is designed for data preparation and can be used to import data, resample it by hour to create a consistent time series index, and then impute missing values. This transformation is crucial for ensuring the data meets the regularity requirements for ARIMA modeling, thereby verifying its suitability.

DUse Amazon SageMaker Autopilot. Create a new experiment that specifies the S3 data location.

Although SageMaker Autopilot has time series forecasting capabilities, it's not the primary tool for manually performing specific data preparation steps (resampling, imputation) required to explicitly *verify* the underlying data's suitability for a traditional ARIMA model.

Concept tested: Time Series Data Preprocessing

Source: https://docs.aws.amazon.com/sagemaker/latest/dg/data-wrangler.html

Topics

#Time Series Preprocessing#SageMaker Data Wrangler#Missing Data Handling#ARIMA Modeling

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