[R] Definition of "lag" is opposite in ts and xts objects!

[Jeff Newmiller]

What makes you think those are the only two options?

I happen to prefer the xts convention, but there is a lot of code out there that successfully uses ts just as it is, and I can't see breaking all of that to meet an arbitrary preference of sign convention. (It isn't my decision anyway...)
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Sent from my phone. Please excuse my brevity.

jpm miao <miaojpm at gmail.com> wrote:

> Example:
>Will ts objects be obsolete or modified?
>
>> a                [,1]
>1983 Q1  2.747365190
>1983 Q2  2.791594762
>1983 Q3 -0.009953715
>1983 Q4 -0.015059485
>1984 Q1 -1.190061246
>1984 Q2 -0.553031799
>1984 Q3  0.686874720
>1984 Q4  0.953911035> lag(a,4)                [,1]
>1983 Q1           NA
>1983 Q2           NA
>1983 Q3           NA
>1983 Q4           NA
>1984 Q1  2.747365190
>1984 Q2  2.791594762
>1984 Q3 -0.009953715
>1984 Q4 -0.015059485> lag(as.ts(a, start=c(1983,1)),4)
>Qtr1         Qtr2         Qtr3         Qtr4
>1982  2.747365190  2.791594762 -0.009953715 -0.015059485
>1983 -1.190061246 -0.553031799  0.686874720  0.953911035
>
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