[R-sig-ME] cumulative Z-structure

[Peter Paprzycki]

In longitudinal,  repeated-measure intervention research, the authors of
HLM 6.03 software recommend using a so called cumulative Z-structure to
reflect the carry-overs of intervention effects from one measurement
occasion to another. Is there an equivalent of this structure with the use
of the lme function? The data set up is annual observations nested in
students crossed by teachers and schools with intervention on and off
between years.



I appreciate guidance. Thank you.

Peter

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