I'm trying to estimate some quantities derived from a lmer object using bootstrap. When I use the function bootMer, a large proportion of replications seems to fail to converge, but if I program the bootstrap using package boot, everything seems go well. Please, find attached a simple example (R script and data) of the problem: with bootMer in 10 simulations, I've got 7 warnings: Warning messages:1: In checkConv(attr(opt, "derivs"), opt$par, ctrl = control$checkConv, : Model failed to converge with max|grad| = 0.00132463 (tol = 0.001, component 1) Thank you in advance. Francisco Fabuel
Model failed to converge in bootMer
2 messages · Francisco Fabuel, Ben Bolker
2 days later
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On 15-07-21 07:48 AM, Francisco Fabuel wrote:
I'm trying to estimate some quantities derived from a lmer object using bootstrap. When I use the function bootMer, a large proportion of replications seems to fail to converge, but if I program the bootstrap using package boot, everything seems go well. Please, find attached a simple example (R script and data) of the problem: with bootMer in 10 simulations, I've got 7 warnings: Warning messages:1: In checkConv(attr(opt, "derivs"), opt$par, ctrl = control$checkConv, : Model failed to converge with max|grad| = 0.00132463 (tol = 0.001, component 1) Thank you in advance. Francisco Fabuel
Scripts and data generally get stripped from messages sent to the mailing list; you may need to post them somewhere else and send along a URL. This is a little surprising since bootMer internally calls boot, so the devil must be in the details somewhere -- which goes back to the fact that we do probably need to see the code (and preferably data)... Ben Bolker -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQEcBAEBAgAGBQJVsSW3AAoJEOCV5YRblxUHOnUIAJAiMOVPVdzo7j8ZBwSZ7fvf rcNOrUQQyEk2gN6ym4i8uplSaM4nh5GHlxlWdsD4IGdJQ3HHBkGVEgpSQl8Q5Jrk 7sbx10WhEYKvuJfnbNyBYFzJvw+Gsm6hQqJsKUZGZrlUTgP/cuH0xLeZX/ljV+Qf 8Cm5KvK5oRUClr8GD3MVd0zC+ZryOpZyZaRM02i+IwfM6B1FGIe4vBrCp8XTK7ht gixDTyx9UFjXHRKsU33XHbg9zA9D+eW7sX45XeyqyHYiwK0Yeb85ujx4Tdkv7PCB yDhUXEyVDC8Z/5HFwh57EalJI6yizZ31KaX5z3QVapH+pVH7hjYlhtq9u3EVG+M= =VEhi -----END PGP SIGNATURE-----