Operators
R uses the following operator tokens:
| + - */%% ^ | arithmetic |
| >>= < <= == != | relational |
| !&| | logical |
| ~ | model formulae |
| <- -> | assignment |
| $ | list indexing (the ‘element name’ operator) |
| : | create a sequence |
Several of the operators have different meaning inside model formulae. Thus * indicates the main effects plus interaction, : indicates the interaction between two variables and ∧ means all interactions up to the indicated power (see p. 332).
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