This is a tree diagram of clustering results made by SPSS system clustering method. 1, the basic idea of system clustering is: firstly, treat n samples as one class, specify the distance between samples and classes, and then merge the two nearest classes into a new class to calculate the distance between the new class and other classes; Repeat the merging of the last two classes, reducing one class at a time, and merging all patterns into one class. The tree map you sent is based on this process.

2. The top row distance value represents the distance value between cases, which is converted by software and cannot be adjusted.

3. Maybe your version of SPSS is old. The tree diagram is broken and may not be easy to distinguish. The new version is all connected line segments. But you can continue to do the analysis. According to the tree diagram,

In the first merger, 7 and 8 are combined into one category, 1 and 3 are combined into one category, and 2, 4 and 5 are combined into one category, which shows that they are the most similar and the shortest.

The second merge merged 6 into 7 and 8 categories.

The third merge merges 1 and 3 into categories of 6, 7 and 8. At this time, there are only two kinds of * * *

The fourth time, put all the individuals into one category.

4, finally merged into a class does not mean that it is not classified, but you determine the number of classes according to your own needs, and then find the results from the diagram. For example, if you finally classify two categories, the results are "7, 8, 6, 1 3" and "2, 4, 5".