Dave Parker had the highest batting average in 1978, with an average of .334.

Interpreted as:

highest batting averages with a minimum of 3.1 PA per team game by a player 1978

	NAME	AVG	SEASON	TM	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	OBP	SLG	OPS	WRC	WRAA	WOBA	WRC+	BRAA
1	Dave Parker D. Parker	.334	1978	PIT	148	581	102	194	32	12	30	117	57	2	92	20	7	642	340	74	0	2	23	8	.394	.585	.979	121	51.3	.424	167	47.9
2	Rod Carew R. Carew	.333	1978	MIN	152	564	85	188	26	10	5	70	78	1	62	27	7	651	249	41	2	6	19	18	.411	.441	.853	100	29.7	.378	136	26
3	Al Oliver A. Oliver	.324	1978	TEX	133	525	65	170	35	5	14	89	31	2	41	8	9	568	257	54	1	9	6	7	.358	.490	.848	86	24	.374	135	22.1
4	Steve Garvey S. Garvey	.316	1978	LAD	162	639	89	202	36	9	21	113	40	1	70	10	5	689	319	66	1	8	9	17	.353	.499	.852	105	29.8	.375	138	29.1
5	Jose Cruz J. Cruz	.315	1978	HOU	153	565	79	178	34	9	10	83	57	0	57	37	9	627	260	53	2	3	9	9	.376	.460	.836	94	25.8	.372	142	29.3
6	Jim Rice J. Rice	.315	1978	BOS	163	677	121	213	25	15	46	139	58	5	126	7	5	746	406	86	1	5	7	15	.370	.600	.970	141	60.3	.425	162	52
7	Lou Piniella L. Piniella	.314	1978	NYY	130	472	67	148	34	5	6	69	34	2	36	3	1	513	210	45	4	1	8	12	.361	.445	.806	72	16	.359	128	15.9
8	Bill Madlock B. Madlock	.309	1978	SFG	122	447	76	138	26	3	15	44	48	3	39	16	5	509	215	44	9	2	11	6	.378	.481	.859	79	24	.380	141	23.5
9	Dave Winfield D. Winfield	.308	1978	SDP	158	587	88	181	30	5	24	97	55	2	81	21	9	649	293	59	0	5	20	13	.367	.499	.866	100	29.3	.378	144	32.1
10	Gene Richards G. Richards	.308	1978	SDP	154	555	90	171	26	12	4	45	64	4	80	37	17	629	233	42	2	4	7	9	.381	.420	.801	89	20.5	.361	133	23.3
11	Jack Clark J. Clark	.306	1978	SFG	156	592	90	181	46	8	25	98	50	3	72	15	11	657	318	79	3	9	8	15	.358	.537	.895	108	36.7	.392	149	36
12	Ben Oglivie B. Oglivie	.303	1978	MIL	128	469	71	142	29	4	18	72	52	0	69	11	7	527	233	51	3	3	10	10	.370	.497	.867	83	25.7	.383	142	24.5
13	Pete Rose P. Rose	.302	1978	CIN	159	655	103	198	51	3	7	52	62	3	30	13	9	729	276	61	2	7	6	8	.362	.421	.783	98	19	.352	120	15.9
14	Jeff Burroughs J. Burroughs	.301	1978	ATL	153	488	72	147	30	6	23	77	117	0	92	1	2	611	258	59	0	6	12	16	.432	.529	.961	115	48.9	.424	159	40.4
15	Dave Concepcion D. Concepcion	.301	1978	CIN	153	565	75	170	33	4	6	67	51	1	83	23	10	624	229	43	3	4	4	14	.357	.405	.763	80	12.9	.345	115	10.2
16	Leon Roberts L. Roberts	.301	1978	SEA	134	472	78	142	21	7	22	92	41	8	52	6	3	528	243	50	3	4	2	7	.364	.515	.879	86	29.2	.391	144	26.2
17	Amos Otis A. Otis	.298	1978	KCR	141	486	74	145	30	7	22	96	66	4	54	32	8	567	255	59	1	10	7	10	.380	.525	.905	95	34	.397	150	31.4
18	Fred Lynn F. Lynn	.298	1978	BOS	150	541	75	161	33	3	22	82	75	1	50	3	6	627	266	58	4	6	11	9	.380	.492	.872	100	32.2	.386	136	25.3
19	Ron LeFlore R. LeFlore	.297	1978	DET	155	666	126	198	30	3	12	62	65	4	104	68	16	741	270	45	1	5	7	11	.361	.405	.766	96	16.2	.347	113	11.2
20	Thurman Munson T. Munson	.297	1978	NYY	154	617	73	183	27	1	6	71	35	3	70	2	3	666	230	34	1	10	6	20	.332	.373	.705	72	-0.4	.317	99	-0.5
21	Warren Cromartie W. Cromartie	.297	1978	MON	159	607	77	180	32	6	10	56	33	7	60	8	8	655	254	48	2	6	5	15	.337	.418	.755	81	10.1	.338	113	9.5
22	Lyman Bostock L. Bostock	.296	1978	CAL	147	568	74	168	24	4	5	71	59	2	36	15	12	637	215	33	4	4	8	26	.362	.379	.740	78	8.6	.336	113	9.2
23	Enos Cabell E. Cabell	.295	1978	HOU	162	660	92	195	31	8	7	71	22	5	80	33	15	694	263	46	3	4	1	14	.321	.398	.720	79	3.5	.324	109	7.3
24	Reggie Smith R. Smith	.295	1978	LAD	128	447	82	132	27	2	29	93	70	1	90	12	5	531	250	58	0	13	8	5	.382	.559	.942	94	36.6	.409	161	36
25	George Brett G. Brett	.294	1978	KCR	128	510	79	150	45	8	9	62	39	1	35	23	7	558	238	62	3	5	6	6	.342	.467	.809	77	16.8	.358	123	14.2