I do not understand why I do not have an intercept in output of my mixed effect model, I do not know how to interpret the result (fixed and random effects). variable preste present the loss in rolling surface, pente mean slope, classeFunc is the functional class of the road and idp_troncon_tembec mean section identifier.
Random effects:
Groups Name Variance Std.Dev.
idp_troncon_tembec agelog 39.00 6.245
Residual 81.68 9.038
Number of obs: 192, groups: idp_troncon_tembec, 111