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匯總（by ..）不會導致列的值順序<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

使用匯總函數生成統計表時，結果表不會生成值順序屬性。有沒有辦法通過列的value order屬性強制匯總表的順序？

在下面的示例中，ls_factor列具有手動設置的值順序。

dt0 = Current Data Table();
ls_collist = dt0 << get column names( string );
//find first parameter column
i_colstart = Contains( ls_collist, "CP_STARTTIME" ) + 1;

r_ColDlg = Column Dialog( col_id = Col List( "X , Factor(s)" ) );
ls_factor = r_ColDlg["col_id"];

For( i = i_colstart, i <= N Items( ls_collist ), i++,
  ycol = Column( dt0, i );
  Summarize(
  s = by( Eval( ls_factor ) ),
  d_mean = Mean( ycol ),
  d_median = Quantile( ycol, 0.5 ),
  d_stdev = Std Dev( ycol ),
  d_min = Min( ycol ),
  d_max = Max( ycol )
  );
);