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Forecasting

Predict future trends and analyze how various factors influence the data trends with advanced forecast models. Forecasting in Zoho Analytics is based on powerful forecasting algorithms that analyze your past data deeply, and come up with the best forecast for the future.

Points to Note 

  • A minimum of seven data points are required for forecasting.
  • Forecast can be applied over Line, Bar chart and its variations, Scatter, Area, and combo charts (without bubble).
  • Forecasting is supported for trend lines, what if analysis, and anomaly detection.
  • Forecasting can be applied for more than one metric column in the Y-axis.

Data Requirements

A Date dimension in the X-axis and at least one metric column in the Y-axis are required to apply forecast.

How to Apply Forecast in Zoho Analytics

  1. Drag and drop the required columns into the report builder.
  2. Click the Analysis icon in the tool bar and select Forecast from the drop-down menu.

    (or)
    Click the Settings icon on the top right and access the Analysis tab.
  3. Click Add Forecast. Select the column for which you intend to forecast values.
  4. Influencing Factors are the additional metrics that affect the target metric (y-axis) that is to be forecasted. This helps understand how different factors influence the outcome of the prediction.
    Click the drop-down menu to choose the Influencing Factors.  A maximum of Five influencing factors can be chosen for forecasting.
  5. The best forecast Model is auto selected based on the characteristics of the data. Vector Auto Regression model is applied by default when there are influencing factors chosen for forecast.
  6. You can also choose the model that should be used and specify the parameters for analysis. Refer to the Forecasting models article to learn more.
  7. Specify the number of data points to forecast in the Forecast Length field.
  8. Specify the number of recent data points to exclude for forecast in the Ignore Last field. For example, if you choose to ignore the last 1 month, the forecast will be based on the data points before that, and the forecast values will begin from the ignored month. This helps exclude incomplete data in cases where the data might be incomplete for the last or current period and to cross-verify if the chosen model predicts the correct value.
  9. The Confidence Percentage refers to the level of certainty that the forecasted values will likely fall within a specified range.
  10. Click the More Options icon to customize the Legend & Styling options.
    • Give a suitable Legend Name for easy identification.
    • Choose the Forecast Style option.
  11. Zoho Analytics allows you to apply forecast for more than one metric column (multiple y-axes).
  12. Customize the display options as needed.
    • The Show Forecast Legend displays a legend to differentiate between the forecasted value and the actual values.
    • The Show Forecast info option displays detailed information about the models used for forecasting and performance metrics. Enabled by default, users can access the forecast information in both view and edit modes, regardless of their role.
    • Enabling the Show Ignored Values option displays the values that were not considered for forecasting.
    • Enabling Display Negative Forecasts as 0 replaces all the negative forecasted values with 0.
  13. Click Apply.

Applying What-if analysis over Forecast

Applying what-if analysis over forecasting can help simulate different scenarios to understand how changes in input variables affect the forecasted outcomes. This aids in understanding the impact and equips you to take decisions accordingly.

Note: Currently, the what-if forecast cannot be applied when influencing factors are chosen.

Treat as What-if Forecasting option applies the what-if analysis only to the forecasted values. Refer to What-If Analysis. article to learn more.

Forecast Model Information

The forecast model information provides details about the model used and statistical information to evaluate the performance (accuracy) of the forecasting model. This option is enabled once the forecasting is applied to a report. This information is specific for each metric being forecasted.

Forecast info can be invoked in one of the following ways:

The below steps are applicable for both Edit and View modes

  1. Click the Settings icon > Analysis > Forecast.
  2. Click Edit, the forecast dialog will open, and click the Forecast Info that appears on hover to view the details.
  3. From the forecast legend in Edit mode: Click the Legend of the forecasted value and choose Forecast Info from the drop-down menu.
  4. From the forecasted data points in View mode: Click any of the forecasted data values and choose Click to view forecast model info.

General Information

This section gives the following details:

  • Training Period: This gives the historical data range used for forecasting data points.
  • Forecast Period: This gives the time frame for which the data is forecasted.

Model Information

Forecast Model: Displays the Forecast model used for prediction. Zoho Analytics supports 5 prediction models such as ARIMA, STL, ETS, Regression and Vector Auto Regression.

Elements of the Forecast models

This section displays the sub methods and parameters or coefficient values of the forecast model used for analysis.

ARIMA Model 

The ARIMA model forecasts values in a time series based on its past values by computing both seasonal and non-seasonal trends. The non-seasonal component captures the general trends and short-term fluctuations in the data that don't follow a repeating pattern. The Seasonal component captures the repeat at regular intervals.

The ARIMA value (p, d, q) (p, d, q)m  denotes the ARIMA model, where the first ordered triplet (p, d, q) represents the non-seasonal component and second ordered triplet represents (p, d, q)m represents the seasonal component.

Non-Seasonal (p, d, q)
  • p is the number of lag observations in the AR (AutoRegressive) component. A lag in time series analysis refers to the use of past values of a variable to predict its future values.
  • d is the number of times the data needs to be difference to make it stationary. (i.e., removing trends or seasonality).
  • q is the number of lagged forecast errors in the MA (Moving Average) component.

The ARIMA model is characterized by 3 main parameters:

  • The AR (AutoRegressive) part of an ARIMA model uses the past values of the time series to predict future values. The parameter p determines the number of past observations (lags) used to predict the current value. For example, p = 2 means the model uses two most recent values to predict the current value
  • Integrated (d) is the method used to make the times series stationary. A stationary time series is one whose properties do not depend on the time at which the series is observed.
  • The MA (Moving Average) part of an ARIMA model captures the dependency between a data point and the residual errors from previous time steps. Instead of relying on past values like AR (AutoRegressive), MA uses past forecast errors to make predictions.

Exponential Smoothing

Exponential smoothing is a time series forecasting method that uses an exponentially weighted average of past observations to predict future values. In the model info dialog, the smoothing model used is listed.


STL 

In the STL model, the data is split into three components namely Trend, Seasonality and Residue.  In the model info dialog, the Decomposition method that is used for smoothing the parameters and the decomposed values are listed.

Regression 

Regression is a statistical method used to understand and model the relationship between a dependent variable and one or more independent variables. Forecast info dialog displays the Regression model and the statistical methods used for evaluating the model's performance. The types of regression models used are linear, logarithmic, exponential, power, and polynomial.

The following are the statistical methods used to assess the performance of the regression model.

  • R-Squared is the statistical method to use to evaluate how well the model fits the data. It calculates how much variation of the dependent variable is explained by the independent variable in the regression model.
  • It shows what percentage of the changes in the outcome (dependent variable) can be explained by the factors you are using in your model (independent variables).
  • Adjusted R-Squared - This ensures that the model does not over fit. The model with the highest Adjusted R-Squared will be applied over your data.
  • The F-statistic is used to assess the overall significance of the model, particularly whether the independent variables together have a statistically significant effect on the dependent variable.
  • The P-value is used to assess the significance of independent variables in the model. It helps determine whether the relationship between the independent and the dependent variable is statistically significant. 

Vector AutoRegression

A Vector AutoRegression (VAR) model is a statistical model used when multiple factors (time series) are interdependent, and each series' forecast values are influenced by its own past values and the past values of the other series.
The forecast info dialog displays the number of lag observations used. For a VAR(p), p denotes that each data point is predicted using its own past values and the past values of other data points, up to p time periods back.

Performance Indicators

Root-Mean-Square Error: 

The RMSE (Root Mean Square Error) calculates the mean difference between the actual value and the forecasted value.

Mean Absolute Percentage Deviation

The MAPE (Mean Absolute Percentage Error) calculates the average absolute percentage difference between the actual values and the forecasted values.

Weighted Mean Absolute Percentage Difference

The WMAPD (Weighted Mean Absolute Percentage Difference) calculates the average of the absolute percentage deviations between the actual values and the forecasted values, with each deviation weighted according to a specified criterion.

Linear Error in Probability Space

The LEPS (Linear Error in Probability Space) calculates the mean absolute difference between the forecast cumulative distribution value and the observation. The Quality of the forecast model is given based on LEPS.

The Quality of the forecasting model is decided based on the LEPS value.

  • If LEPS  > 80% then the forecast model accuracy is considered to be Good.
  • If LEPS  between  30 % to 80% then the forecast model accuracy is considered to be Acceptable.
  • If LEPS  < 30% then the forecast model accuracy is considered to be Poor.

Corrected Akaike Information Criterion

AICc (Corrected Akaike Information Criterion) is a modification of the Akaike Information Criterion (AIC), which is used for model selection. The AIC estimates the quality of a statistical model relative to other models.

Bayesian Information Criterion

BIC (Bayesian Information Criterion) is another method used for model selection in statistics.

How Forecasting works in Zoho Analytics

Zoho Analytics offers a powerful forecasting engine which predicts future data points based on past data. The forecasting engine offers a range of customizations such as number of units to be forecasted, number of data points to be ignored in the past data and the formatting to be applied over the forecasted data points.

The following points describe how the forecasting engine works in Zoho Analytics:

  1. The forecasting engine analyses past data points.
  2. Based on the past data, the forecasting engine will identify the periodicity using auto-correlation method.
  3. Then it computes the seasonality, trend and randomness using the past data.
  4. By iterative processing, the forecasting engine fine-tunes the computed seasonality, trend and randomness.
  5. The engine runs linear, logarithmic and exponential regressions and identifies the data series falls under linear, logarithmic or exponential.
  6. The accuracy of the predicted results will be verified using Hindcasting. Hindcasting is the process of predicting the past data points and verify the same with the actual points.
  7. Once all verifications are done, the forecasting engine produces the final forecasted points

Working with the Forecast Reports

  • Zoho Analytics allows you to export data in a variety of file formats. While exporting a forecast report, the forecasted values are appended to the end, and another column named Type is added to differentiate between the Actual Value and the Forecasted Value. If the confidence percentage is set, then the additional columns are added to display the upper and lower confidence limits.
  • The forecasted value changes as the data gets updated; Data snapshots help to maintain a record of the forecasted values at specific periods

Troubleshooting Tips

1. I could not find "Forecast" option in chart settings. Why?

This could happen when the forecast constraints are not met. Please refer to the constraints specified.

2. Already configured forecasting settings are not available now. Why?

This could happen when the design of the chart has been modified, which does not match the forecast constraints.

3. I have configured forecasting for my chart. But it says, "Forecasting is disabled as the data is completely ignored". Why?

This could happen if you had set to ignore all the past data points from "Ignore Last" setting.

4. I have configured forecasting for my chart. But it says, "Forecasting is disabled as there is not enough data to identify pattern". Why?

This could happen when there is no sufficient data produced to forecasting engine to come up with forecasted data points.

5. I have configured forecasting for my chart. But it says, "Forecasting is disabled as there are more than 40% empty values". Why?

When the past data points provided to the forecasting engine has more null values, the forecasted points might be inaccurate. To avoid this, the forecasting engine will discard the process when the null values are more than 40% in the given data.

6. I have configured forecasting for my chart. But it says, "Column cannot be forecast as more than 5 data points is required". Why?

To produce an accurate forecast, the data points to be considered for forecasting should be more than 5 points. Try changing the time series in X-axis to a more granular function which may result in more data points. For example, If the existing time series is Year, then change to Month & Year.

6. The forecasted points shown in chart are different to the shared users. Why?

The chart could have been shared with different filter criteria to the shared users. Number of past data points available in the shared data could very for different shared users, hence the forecasted points are different for shared users.

The underlying data and drill down options are not available for forecasted data points. Why?

The forecasted points will not have underlying data generated for each of the forcasted data points. Hence, View Underlying Data and Drill Down options will not be available for forecasted data points.

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