我的树状图怎么这个样子呀？哪位高手好心的解释一下，急死了！小菜先行谢谢了！

* * * * * * H I E R A R C H I C A L C L U S T E R A N A L Y S I S * * * * * *

Dendrogram using Ward Method

Rescaled Distance Cluster Combine

C A S E 0 5 10 15 20 25
Label Num +---------+---------+---------+---------+---------+

VAR00003 3 -+
VAR00006 6 -+-+
VAR00004 4 -+ +-+
VAR00002 2 ---+ +-------------------------+
VAR00008 8 -+---+ +-----------------+
VAR00010 10 -+ I I
VAR00007 7 -----+-------------------------+ I
VAR00011 11 -----+ I
VAR00001 1 -+ I
VAR00009 9 -+-----------------------------------------------+
VAR00005 5 -+