[R-sig-ME] lme4 upgrade broke my old code?

[Ben Bolker]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 15-03-17 02:24 PM, Stuart Luppescu wrote:
> On Tue, 2015-03-17 at 13:27 -0400, Ben Bolker wrote:
>> I think that starting with version 1, lme4 was not compatible
>> with
>>> the lower version code. I am afraid that you will have to
>>> calculate the old models again with the newer lme4.
>>> 
>>> Cheers,
>>> 
>>> Marko
>> 
>> There is some help here.  If you install the lme4.0 package (see
>> the README at https://github.com/lme4/lme4 ) you can at least
>> use convert_old_lme4() to update lme4 pre 1.0 to lme4.0  ...  We
>> don't currently have a function to convert stuff that old to
>> modern lme4 (lots of the internal structures have changed), but
>> if you want to badly enough you can use lme4.0 ...
> 
> That's what I was afraid of. Thanks Marko and Ben. I'm rerunning it
> now -- takes a long time with 2.5 million observations.
> 


  Even in the absence of my more complicated suggestion (trying to
populate the merMod object with already-computed stuff), I would make
sure you are

(1) starting from the previously computed best-fit values
(2) using the known tricks for optimizing speed -- in particular I
would use control=lmerControl(optimizer="nloptwrap"), as the default
bobyqa optimizer uses tolerance criteria that are probably stricter
than they need to be.

   cheers
    Ben

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)

iQEcBAEBAgAGBQJVCd9lAAoJEOCV5YRblxUHRRkH/31iRyILEMpdlnc1NqH/Zpyf
z0E5/Juv44PPtZxl8t2EC4zbrl+UPm7ML9olvjHa/W6vGtyfD3M9hIHi4FkyHhWx
eOjmtVzl8v9aAtyMDIYGEZC+aDxttPcpe71JieWMw4zEPSXZTMyGpzDrlIJ/h+Lg
Ts74sw9iXb8Q/qgxnY5PVMICt+XyxflcsfZ8nzha5I/ECdgw9F36RjizoJh9fFH8
eH2Q1iH+VIwT/nuQmLNy9yQOUttTpV/7jsSRVwb3gFAell2JioQKa9DVudYLE20I
Mssb0QAQ4x89iiiVrlmmPgO0ZSRW8NpPUemC7l8hR3S8eNco98Cq5kSD0PVMSPU=
=XkiQ
-----END PGP SIGNATURE-----