q2a — transforms quarterly data into annual ones
tsout=q2a(tsin,ind)
tsin= a qurterly timeseries
ind =
- -1 if the annual data is to be the sum of the corresponding quarters
- 0 if the annual data is to be the mean of the corresponding quarters
- 1 if the annual data is to be the value of the first quarter
- 2 if the annual data is to be the value of the second quarter
- 3 if the annual data is to be the value of the third quarter
- 4 if the annual data is to be the value of the fourth quarter
ind is optional; if not provided, it is set to -1
tsout = the corresponding annual time series
if x is a annual ts (such as reshape([1:13],'1978q2') then 1) y = q2a(x) 2) y = q2a(x,-1) 3) y = q2a(x,2) Examples 1 and 2 give exactly the same result: a yearly ts (from 1979a to 1980a with values 22 and 38 with the ts x above). Example 3 gives a yearly ts whose values come from the second quarter of each year (from 1978a to 1981q4 with values 1, 5, 9, 13 with the ts x above).