SPECTRA

SPECTRA 可在 預測及決策樹狀結構中使用。

SPECTRA 繪製一個以上數列的週期圖及光譜密度函數估計值。 您也可以要求雙變數光譜分析。 移動平均值可用來平滑化週期值，以產生光譜密度。

SPECTRA VARIABLES= series names

 [/{CENTER NO**}]   
   {CENTER     }     

 [/{CROSS NO**}]
   {CROSS     } 

 [/WINDOW={HAMMING** [({5   })]    }]
          {            {span}      }
          {BARTLETT [(span)]       } 
          {PARZEN [(span)]         } 
          {TUKEY [(span)]          } 
          {UNIT or DANIELL [(span)]} 
          {NONE                    } 
          {w-p, ..., w0, ..., wp   } 

 [/PLOT= [P] [S] [CS] [QS] [PH] [A]     
         [G] [K] [ALL] [NONE]       
         [BY {FREQ  }]]  
             {PERIOD}    

 [/SAVE = [FREQ (name)] [PER (name)] [SIN (name)] 
          [COS (name)]  [P (name)]   [S (name)]      
          [RC (name)]   [IC (name)]  [CS (name)]     
          [QS (name)]   [PH (name)]  [A (name)]      
          [G (name)]    [K (name)]]                  

 [/APPLY [='model name']]

* * 如果省略次指令，則為預設值。

此指令會讀取作用中資料集，並導致執行任何擱置指令。 如需相關資訊，請參閱主題 指令順序 。

SPECTRA 指令的語法可以從 Spectral Plots 對話框產生。

範例

SPECTRA VARIABLES = HSTARTS.