[R-sig-ME] Set two coefficients to be equal in lme()

[Uanhoro, James]

Dear Simon,

Create a variable that is the sum of D1 * Treat and D2 * Treat and place it in the model:

data$new_var <- (data$D1 + data$D2) * data$Treat
lme(value ~ 0 + D1 + D2 + new_var, random = ~0 + D1 + D2 | Student, data = data)

The coefficient of new_var in the model above is the coefficient for both variables if their coefficients were constrained equal.

James.

On Fri, 2021-01-15 at 23:42 -0600, Simon Harmel wrote:
Dear All,

I was wondering if it might be possible in my below model to set
"D1:Treat" and "D2:Treat" to be equal?

lme(value ~ 0 + D1 + D2 + D1:Treat + D2:Treat, random = ~0 + D1 + D2 |
Student, data = data)

Thank you,
Simon

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