Prediction of English Vocabulary Learning Difficulty and Adjustment of Teaching Strategies Based on Decision Tree Algorithm

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Classification prediction model generalization ability evaluation index

Categories	Precision	Recall	F1	Sample size
Simplicity	1	0.81	0.92	9
Medium	0.97	1	0.97	60
Difficulty	1	0.99	0.98	6
Macroid	0.98	0.95	0.99	70
Weighted mean	0.98	0.98	0.97	70

Test the test of the study attitude scale before and after the test

	Pair difference					t	df	Sig.2
Pre-exp.	Mean	SD	SEM	95%CI Upper limit	95%CI Lower limit
After-exp.	-6.1694	7.1562	0.9845	-8.1456	-4.1977	-6.279	49	0.000

Model set error evaluation index

Tries	1	2	3	4	5	6	7+
MAE	0.19	0.87	1.83	1.14	1.15	1.42	0.63
R2	0.85	0.92	0.94	0.92	0.92	0.92	0.91

Descriptive statistics before and after dimensions

		Mean	N	SD	SEM
Lexical acquisition	Pre-exp.	29.548	50	4.6258	0.6358
	After-exp.	31.056	50	5.4698	0.7589
Memorize words	Pre-exp.	20.456	50	4.0658	0.5546
	After-exp.	21.598	50	4.2879	0.5839
Review the main ways of words	Pre-exp.	11.395	50	2.7892	0.3476
	After-exp.	13.245	50	3.2689	0.4215
Review the frequency of words	Pre-exp.	8.657	50	1.4539	0.2103
	After-exp.	10.698	50	1.4258	0.1987

Test the matching sample t before and after the dimensions

		Pair difference					t	df	Sig.2
		Mean	SD	SEM	95%CI Upper limit	95%CI Lower limit
Lexical acquisition	(Pre-exp.)-(After-exp.)	-1.6985	5.0598	0.6985	-3.2655	-0.3036	-2.436	49	0.019
Memorize words	(Pre-exp.)-(After-exp.)	-1.3356	4.0987	0.5698	-2.4561	-0.2152	-2.368	49	0.023
Review the main ways of words	(Pre-exp.)-(After-exp.)	-1.3025	3.1456	0.4316	-2.1625	-0.4358	-3.025	49	0.006
Review the frequency of words	(Pre-exp.)-(After-exp.)	-1.6548	1.9784	0.2874	-2.2358	-1.1167	-6.136	49	0.000

Word memory retrieval difficulty clustering results

Cluster	0	1	2	3	4	5
Quantities	233	17	4	6	6	4
1 try	0.31	1.28	0.28	0.02	0.21	0.41
2 tries	5.02	14.51	1.96	1.35	4.02	10
3 tries	22.73	33.28	10.27	9	25.27	37.04
4 tries	34.82	30.22	24.26	26.01	40.97	35.01
5 tries	24.52	15.25	31.81	36.41	22.54	13.21
6 tries	10.65	5.19	25.25	23.01	6.19	3.2
7 or more	1.74	0.84	6.5	3.83	0.79	0.01

The study attitude scale was descriptive statistics

		Mean	N	SD	SEM
Learning attitude	Pre-exp.	71.352	50	9.451	1.289
	After-exp.	78.045	50	11.568	1.536

The model reduces the evaluation of some input

Delete	Accuracy	Precision	Recall	F1
-	0.99	0.98	0.99	0.97
1	0.96	0.95	0.93	0.93
2	0.95	0.99	0.97	0.95
3	0.99	0.99	0.99	0.99
4	0.94	0.96	0.96	0.95
5	0.99	0.99	0.99	0.99
6	0.98	0.98	0.99	0.95
7	0.98	0.99	0.99	0.99