Name

q2a — transforms quarterly data into annual ones

CALLING SEQUENCE

tsout=q2a(tsin,ind)

PARAMETERS

Input

• 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

Output

• tsout = the corresponding annual time series

DESCRIPTION

Transforms quarterly data into annual ones.

EXAMPLE

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).

               

AUTHOR

Eric Dubois 2002