Research on Classroom Teaching Quality Evaluation and Feedback System Based on Big Data Analysis

Table 6

Comparison of three principal component analysis results.

	Original principal component analysis			Mean value principal component analysis			Improved principal component analysis
	Characteristic value	Contribution rate (%)	Cumulative contribution (%)	Characteristic value	Contribution rate (%)	Cumulative contribution (%)	Characteristic value	Contribution rate (%)	Cumulative contribution (%)
1	9.7663	81.3854	81.3854	8.4675	79.3932	82.7765	7.1398	78.9847	83.1915
2	0.8029	6.691	88.0765	0.7638	7.4178	90.1943	0.6894	8.1453	91.3366
3	0.4977	4.1474	92.2239	0.3795	4.2844	94.4787	0.5894	3.5098	94.8486
4	0.3906	3.2548	95.4787	0.3602	2.0042	96.4829	0.2947	2.1298	96.9762
5	0.2254	1.878	97.4787	0.1883	1.4203	97.9032	0.1148	1.3639	98.3401
6	0.189	1.5747	98.9314	0.0945	1.2859	99.1891	0.0381	1.0371	99.3772
7	0.053	0.4419	99.3733	0.024	0.3698	99.5589	0.0251	0.2987	99.6759
8	0.0425	0.3538	99.7271	0.0278	0.2986	99.8575	0.0198	0.1984	99.8743
9	0.0228	0.1901	99.9172	0.0119	0.0875	99.945	0.0101	0.0839	99.9582
10	0.0077	0.0641	99.9813	0.0039	0.0398	99.9848	0.0029	0.0289	99.9871
11	0.0014	0.0114	99.9926	0.0013	0.0113	99.9961	0.0009	0.0108	99.9979
12	0.0009	0.0074	100	0.0005	0.0039	100	0.0002	0.0021	100