Advanced Time Series Predictions (Intermediate Data Mining Tutorial)

Artikel
08/31/2016

Applies To: SQL Server 2016 Preview

You saw from exploring the forecasting model that although sales in most of the regions follow a similar pattern, some regions and some models, such as the M200 model in the Pacific region, exhibit very different trends. This does not surprise you, as you know that differences among regions are common and can be caused by many factors, including marketing promotions, inaccurate reporting, or geopolitical events.

However, your users are asking for a model that can be applied worldwide. Therefore, to minimize the effect of individual factors on projections, you decide to build a model that is based on aggregated measures of worldwide sales. You can then use this model to make predictions for each individual region.

In this task, you will build all the data sources that you need to perform the advanced prediction tasks. You will create two data source views for use as inputs to the prediction query, and one data source view to use in building a new model.

Steps

Prepare the extended sales data (for prediction)
Prepare the aggregated data (for building the model)
Prepare the series data (for cross-prediction)
Predict using EXTEND
Create the cross-prediction model
Predict using REPLACE
Review the new predictions

Creating the New Extended Sales Data

To update your sales data, you will need to get the latest sales figures. Of particular interest are the data just in from the Pacific region, which launched a regional sales promotion to call attention to the new stores and raise awareness of their products.

For this scenario, we’ll assume that the data has been imported from an Excel workbook that contains just three months of new data for a couple of regions. You’ll create a table for the data using a Transact-SQL script, and then define a data source view to use for prediction.

Create the table with new sales data

In a Transact-SQL query window, execute the following statement to add the sales data to the AdventureWorksDW database (or any other database).

USE [database name];  
GO  
IF OBJECT_ID ([dbo].[NewSalesData]) IS NOT NULL   
    DROP TABLE [dbo].[NewSalesData];  
GO  
CREATE TABLE [dbo].[NewSalesData](  
[Series] [nvarchar](255) NULL,  
[NewDate] [datetime] NULL,  
[NewQty] [float] NULL,  
[NewAmount] [money] NULL  
) ON [PRIMARY]  

GO

Insert the new values using the following script.

INSERT INTO [NewSalesData]  
(Series,NewDate,NewQty,NewAmount)  
VALUES('T1000 Pacific', '7/25/08', 55, '$130,170.22'),  
('T1000 Pacific', '8/25/08', 50, '$114,435.36 '),  
('T1000 Pacific', '9/25/08', 50, '$117,296.24 '),  
('T1000 Europe', '7/25/08', 37, '$88,210.00 '),  
('T1000 Europe', '8/25/08', 41, '$97,746.00 '),  
('T1000 Europe', '9/25/08', 37, '$88,210.00 '),  
('T1000 North America', '7/25/08', 69, '$164,500.00 '),  
('T1000 North America', '8/25/08', 66, '$157,348.00 '),  
('T1000 North America', '9/25/08', 58, '$138,276.00 '),  
('M200 Pacific', '7/25/08', 65, '$149,824.35'),  
('M200 Pacific', '8/25/08', 54,  '$124,619.46'),  
('M200 Pacific', '9/25/08', 61, '$141,143.39'),  
('M200 Europe', '7/25/08', 75, '$173,026.00'),  
('M200 Europe', '8/25/08', 76, '$175,212.00'),  
('M200 Europe', '9/25/08', 84, '$193,731.00'),  
('M200 North America', '7/25/08', 94, '$216,916.00'),  
('M200 North America', '8/25/08', 94, '$216,891.00'),  
('M200 North America', '9/25/08', 91,'$209,943.00');

Warning

The quotation marks are used with the currency values to prevent problems with the comma separator and the currency symbol. You could also pass in the currency values in this format: 130170.22

Note that the dates used in the sample database have changed for this release. If you are using an earlier edition of AdventureWorks, you might need to adjust the inserted dates accordingly.

Create a data source view using the new sales data

In Solution Explorer, right-click Data Source Views, and then select New Data Source View.
In the Data Source View wizard, make the following selections:

Data Source: Adventure Works DW Multidimensional 2012

Select Tables and Views: Select the table that you just created, NewSalesData.
Click Finish.
In the Data Source View design surface, right-click NewSalesData, and then select Explore Data to verify the data.

Warning

You will use this data for prediction only, so it does not matter that the data is incomplete.

Creating the Data for the Cross-Prediction Model

The data that was used in the original forecasting model was already grouped somewhat by the view vTimeSeries, which collapsed several bike models into a smaller number of categories, and merged results from individual countries into regions. To create a model that can be used for world-wide projections, you will create some additional simple aggregations directly in the Data Source View Designer. The new data source view will contain just a sum and an average of the sales of all products for all regions.

After you have created the data source used for the model, you must create a new data source view to use for prediction. For example, if you want to predict sales for Europe using the new worldwide model, you must feed in data for the Europe region only. So you will set up a new data source view that filters the original data, and change the filter condition for each set of prediction queries.

To create the model data using a custom data source view

In Solution Explorer, right-click Data Source Views, and then select New Data Source View.
On the welcome page of the wizard, click Next.
On the Select Data Source page, select Adventure Works DW Multidimensional 2012, and then click Next.
In the page, Select Tables and Views, do not add any tables—just click Next.
On the page, Completing the Wizard, type the name AllRegions, and then click Finish.
Next, right-click the blank data source view design surface, and then select New Named Query.
In the Create Named Query dialog box, for Name, type AllRegions, and for Description, type Sum and average of sales for all models and regions.

In the SQL text pane, type the following statement and then click OK:

SELECT ReportingDate,   
SUM
([Quantity]) as SumQty, AVG
([Quantity]) as AvgQty,  
SUM
([Amount]) AS SumAmt, AVG
([Amount]) AS AvgAmt,  
'All Regions' as [Region]  
FROM dbo.vTimeSeries   
GROUP BY ReportingDate

Right-click the AllRegions table, and then select Explore Data.

To create the series data for cross-prediction

In Solution Explorer, right-click Data Source Views, and then select New Data Source View.
In the Data Source View wizard, make the following selections:

Data Source: Adventure Works DW Multidimensional 2012

Select Tables and Views: Do not select any tables

Name: T1000 Pacific Region
Click Finish.
Right-click the empty design surface for T1000 Pacific Region.dsv, and then select New Named Query.

The Create Named Query dialog box appears. Retype the name, and then add the following description:

Name: T1000 Pacific Region

Description: FiltervTimeSeriesby region and model
In the text pane, type the following query, and then click OK:
```
SELECT ReportingDate, ModelRegion, Quantity, Amount  
FROM dbo.vTimeSeries  
WHERE (ModelRegion = N'T1000 Pacific')  
```
Note

Since you will need to create predictions for each series separately, you might want to copy the query text and save it to a text file so that you can re-use it for the other data series.
In the Data Source View design surface, right-click T1000 Pacific, and then select Explore Data to verify that the data is filtered correctly.

You will use this data as the input to the model when creating cross-prediction queries.

Next Task in Lesson

Time Series Predictions using Updated Data (Intermediate Data Mining Tutorial)

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