Unobserved Components Model

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Unobserved Components Model

I an using the Unobserved components model. my data demonstrates a U shaped pattern instead of a linear one. i want to integrate a quadratic trend in the model how can i do that in the following syntax?

proc ucm data = setA;

id year interval = year;

model logsetA;

irregular;

level;

slope;

cycle;

estimate;

run;


thank youUn

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