 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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