交互相關性
使用此窗口為所有擬合殘差和輸入執行相關性分析。殘差與預測窗口上設置的預測時域相對應。
交叉相關性窗口字段
Segments(數據段):包含工作區內所有數據段的下拉列表。
Input(輸入):可與輸出殘差進行相關性分析的輸入下拉列表。輸入和輸出殘差之間的顯著相關性可以指示脫離模型或錯誤的模型結構。
Cross tag(交互位號):所有可用于相關性分析的輸出殘差下拉列表。
Number of Lags(滯后數):為每個位號計算和繪圖的相關系數數量。
Diff Data(差分數據):在計算相關系數之前,對數據進行差分以去除數據漂移。
圖例
Show(顯示):若選中,相應的模型預測將顯示在預測圖上。
Color(顏色):雙擊修改預測圖的顏色;此線的顏色也對應于overlay和FIR fit窗口中線條的顏色。
Name(名稱):位號/預測模型源的名稱。
Description(說明):位號/模型源描述。
Units(單位):位號單位。
Fit報告和打印
你可以從Tools(工具)菜單或通過鼠標右鍵單擊樹節點上的菜單生成Fit報告。生成的報告采用HTML格式,并包含:
?工作區信息摘要。
?擬合組信息摘要。
?擬合組Inputs和Outputs。
?擬合組結構表。
使用HTML格式的報告,你可以:
?保存報告。
?打印報告。
?復制全部或部分報告內容,并將其粘貼到MS Word,Excel或PowerPoint中。
若要在FIR Fit,Parametric Fit(參數擬合),Overlay(層疊),Simulation和Cross Correlation(交互相關性)選項卡子窗口中生成包含擬合模型參數和階躍響應圖的HTML文件:
?打開File(文件)菜單并選擇Print Current Screen to HTML(將當前屏幕打印為HTML)。
例如以下為從Fit Overlay選項卡窗口生成的HTML示例文件:
概述–Fit Analysis(擬合分析)
Fit Analysis(擬合分析)選項卡提供了分析和比較Fit Group(擬合組)內所有擬合的方法。 執行的分析是基于仿真,預測和誤差的。 還有一個擬合選擇/導出選項卡,在其中你可以選擇最佳擬合結果以獲得擬合組級別的模型,然后可以將其導出到模型。
原文:
Cross Correlations
Use this window to perform cross-correlation analysis between all the fit residuals and the inputs. The residuals correspond to the prediction horizon set on the predictions window.
**Cross Correlation Window Fields **
**Segments: **Drop down list with all the workspace segments.
Input: Drop-down list of all the inputs in the analysis available for cross-correlation analysis with the output residuals. Significant correlations between inputs and output residuals may indicate undermodeling or wrong model structures.
**Cross tag: **Drop-down list of all the output residuals available for cross-correlation analysis.
Number of Lags:Number of correlation coefficients calculated and plotted for each tag.
Diff Data: Difference the data to remove data drift before computing correlation coefficients.
**Legend Table **
**Show: **If checked, the corresponding model prediction is shown on the predictions plot.
Color: Double-click to modify the prediction plot line color; this line color also corresponds to the line colors in the overlay and FIR fit windows.
Name:Name of the tag/prediction model source.
**Description: Tag/model source description.
Units: Tag units.
Fit Reports and Printing **
You can generate a Fit Report from either the Tools menu or using the menu opened by clicking the right mouse button over the tree node. The generated report is in HTML format and contains:
?Summary workspace information.
?Summary fit group information.
?Fit group Inputs and Outputs.
?Fit group structure table.
With the report in HTML format you can:
?Save the report.
?Print the report.
?Copy all or parts of the report and paste it into MS Word, Excel, or PowerPoint.
To generate HTML files containing fit model parameters and step response plots on the FIR Fit, Parametric Fit, Overlay, Simulation and Cross Correlation tabbed subwindows:
?Open the File menu and select Print Current Screen to HTML.
Example HTML file produced from the Fit Overlay tabbed window:
Overview - Fit Analysis
The Fit Analysis tab provides ways to analyze and compare all the Fits within a Fit Group. The analysis is performed based on simulations, predictions and errors. There is also a fit select/export tab where you can select the best fit results to arrive at a fit group level model which can then be exported to a model.
2016.11.26