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sas中 rate=intrr(1,-400,100,200,300); 此函数intrr第一个参数是1，有时候是2.有什么区别啊 谢谢大家啦

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关键词：Rate int ATE 400

intrr(freq,cf0,cf1,...,cfn)
Returns the internal rate of return, as a fraction. freq (> 0) is
the number of payments over a specified base period of time
associated with the desired IRR (set freq = 0 for continuous
compounding). Set freq = 3, for example, for a quarterly IRR
(three-month base period) with monthly payments. cf0, cf1,...,
cfn are two or more start-of-period cash payments (< 0) or
inflows (> 0) occurring at equally spaced times 0, 1,..., n. irr
(p. 91) returns the same result but as a percentage.
Example: intrr(1,-400,100,200,300) → 0.19438.
在资料上看到的，你自己理解一下吧，有些好像是术语我不太懂。