Cathy,
How does this model look?
[(1-B**4)]Y(T) = 20.767
+[X1(T)][(1-B**4)][(+ 56.1962)] :PULSE 7/
4 I~P00028test
+[X2(T)][(1-B**4)][(+ 74.4301)] :PULSE 9/
4 I~P00036test
+[X3(T)][(1-B**4)][(- 59.9872)] :PULSE 6/
3 I~P00023test
+[X4(T)][(1-B**4)][(- 27.2187)] :PULSE 7/
1 I~P00025test
+ [(1- .435B** 1)]**-1 [A(T)]
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