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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