Analyzing the Investment Behavior in the Iranian Stock Exchange during the COVID-19 Pandemic Using Hybrid DEA and Data Mining Techniques

Table 3

Results of clustering.

Data	Time of clustering	Whole data	MSE ()	Clusters	Number of members of each cluster	Variance of each cluster ()	Mean of sales	Mean of transaction values
Buying	1.52 seconds	31587	2.5806	First cluster	2	0.1122	13,050,000	77,125,415
				Second cluster	78	2.9596	938,669	11,374,316
				Third cluster	31,507	5.0798	17,542	142,916
Selling	0.78 seconds	25056	1.9059	First cluster	49	1.0443	1,066,943	14,754,968
				Second cluster	495	1.2555	292,086	2,610,905
				Third cluster	9	1.3095	3,892,495	39,812,682
				Fourth cluster	24503	1.6608	15,617	124,063
Mean of transaction values, one US dollar = 42000 IRR