看到很多坛友对R语言中的Formulas的具体规定不太了解，特意收集了一些相关资料，
可供下载：




另外将主要的应用举例如下：

Right Side of Formula	Meaning
A + B	main effects of A and B
A:B	interaction of A with B
A*B	main effects and interactions = A + B + A:B
A*B*C	main effects and interactions A+B+C+A:B+A:C+B:C+A:B:C
(A+B+C)^2	A, B, and C crossed to level 2: A+B+C+A:B+A:C+B:C
A*B*C-A:B:C	same as above: main effects plus 2-way interactions
1 + state + state:county	nested ANOVA
1 + state + county%in%state	nested ANOVA emphasizing county nested in state
state / county	nested ANOVA
(1 / subject)	fit random intercepts for subjects
(1+time / subject)	fit both random intercepts and random subject-specific slopes