# Specification
# shipley.growth <- list(
# lme4::lmer(Growth ~ Date + (1 | site) + (1 | tree), data = shipley),
# lme4::lmer(Growth ~ Date + DD + (1 | site) + (1 | tree), data = shipley),
# lme4::lmer(Growth ~ Date + DD + lat + (1 | site) + (1 | tree),
# data = shipley)
# )
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