irregular component of seasonal model?

[hardmann]

dear Tom:

In local level model with seasonal, the measurement equation is: yt=ut+rt+et. While calculating measuring error or irregular component is et = y- level, why does not et = y- level -seasonal. I found that in commandeur& koopman(2007) chart4_inflation and chart4_UK_data

hardmann

[TomDoan]

dear Tom:

In local level model with seasonal, the measurement equation is: yt=ut+rt+et. While calculating measuring error or irregular component is et = y- level, why does not et = y- level -seasonal. I found that in commandeur& koopman(2007) chart4_inflation and chart4_UK_data

hardmann

You're correct. Those should both have:

set level = xstates(t)(1)
set seasonal = xstates(t)(2)
set fitted = %dot(c,xstates)
set irreg = ukinflation-fitted