[R] Rendo and dataMultilevelIV

[cjg15]

Hi - Does anyone know what the variables CID and SID are in the
dataMultilevelIV dataset?

The example from page 18-19 of
https://cran.r-project.org/web/packages/REndo/REndo.pdf has

formula1 <- y ~ X11 + X12 + X13 + X14 + X15 + X21 + X22 + X23 + X24 + X31 +
X32 + X33 + (1 + X11 | CID) + (1|SID)

what exactly are the (1 + X11|CID) and (1|SID) terms?

does (1|SID) mean random intercepts for SID, and SID is student ID?

Thanks in advance, Chris

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