Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Supported by

Misleading AIC in Linear Mixed Models in JASP?

Hello,

I am not sure this is the right section (I could not find one that fits better).

I recently applied Linear Mixed Models in JASP. As an output, JASP also reports AIC.

However, that AIC is computed on grounds of the REML deviance, and not on grounds of the plain deviance (both of which are given in the same output).

To my knowledge (verified with some colleagues) the so-computed AIC only allows for comparison between models that share exactly the same fixed-effects structure, and are therefore compared only for their random-effects structure.

Clearly, this is not always the case - actually, it is relatively rare. By far the most frequent case is that one wishes to compare models that differ in both structures. This is pretty natural, indeed if one assumes that effect A is present on the average (i.e. in the fixed design), the default choice is that A should also vary across clusters (e.g., subjects), thus, it should also be included in the random design.

Following this line, as a default, AIC should be computed subtracting 2p (twice the N of parameters) from the *plain deviance*; alternatively, JASP might report both an AIC derived from the plain deviance, and an AIC computed from the REML deviance, with a short note explaining that the latter ought to be used only to compare models that vary just in their random components.

Comments

  • Hi Alessio,

    Thanks for pointing this out. We should be more informative about this. The best avenue for such a feature request would be our GitHub page, so that we can add it to our todo-list and assign it to the relevant people. As I understand right now, you could still compute the appropriate AIC, by manually doing this subtraction, but of course it would be neat to include the option to select which deviance to use for the AIC (and to be more transparent about its appropriate applications).

    Kind regards,

    Johnny

  • Hi Alessio,

    Yes and no. Yes, you are totally right that the likelihoods of models fitted with REML cannot be compared to likelihoods of models with different fixed effects. This extends to AIC.

    But no, this also extends to the unpenalised likelihood. Once the model is fit with REML, there is nothing that can be done. The only way to compare likelihoods and AICs for mixed models with different fixed effects is using a ML (i.e., non-REML) fit.

    ML fits are used when using likelihood-ratio tests or parametric bootstrap for "tests of model terms".

    Best,

    Henrik

Sign In or Register to comment.

agen judi bola , sportbook, casino, togel, number game, singapore, tangkas, basket, slot, poker, dominoqq, agen bola. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 50.000 ,- bonus cashback hingga 10% , diskon togel hingga 66% bisa bermain di android dan IOS kapanpun dan dimana pun. poker , bandarq , aduq, domino qq , dominobet. Semua permainan bisa dimainkan hanya dengan 1 ID. minimal deposit 10.000 ,- bonus turnover 0.5% dan bonus referral 20%. Bonus - bonus yang dihadirkan bisa terbilang cukup tinggi dan memuaskan, anda hanya perlu memasang pada situs yang memberikan bursa pasaran terbaik yaitu http://45.77.173.118/ Bola168. Situs penyedia segala jenis permainan poker online kini semakin banyak ditemukan di Internet, salah satunya TahunQQ merupakan situs Agen Judi Domino66 Dan BandarQ Terpercaya yang mampu memberikan banyak provit bagi bettornya. Permainan Yang Di Sediakan Dewi365 Juga sangat banyak Dan menarik dan Peluang untuk memenangkan Taruhan Judi online ini juga sangat mudah . Mainkan Segera Taruhan Sportbook anda bersama Agen Judi Bola Bersama Dewi365 Kemenangan Anda Berapa pun akan Terbayarkan. Tersedia 9 macam permainan seru yang bisa kamu mainkan hanya di dalam 1 ID saja. Permainan seru yang tersedia seperti Poker, Domino QQ Dan juga BandarQ Online. Semuanya tersedia lengkap hanya di ABGQQ. Situs ABGQQ sangat mudah dimenangkan, kamu juga akan mendapatkan mega bonus dan setiap pemain berhak mendapatkan cashback mingguan. ABGQQ juga telah diakui sebagai Bandar Domino Online yang menjamin sistem FAIR PLAY disetiap permainan yang bisa dimainkan dengan deposit minimal hanya Rp.25.000. DEWI365 adalah Bandar Judi Bola Terpercaya & resmi dan terpercaya di indonesia. Situs judi bola ini menyediakan fasilitas bagi anda untuk dapat bermain memainkan permainan judi bola. Didalam situs ini memiliki berbagai permainan taruhan bola terlengkap seperti Sbobet, yang membuat DEWI365 menjadi situs judi bola terbaik dan terpercaya di Indonesia. Tentunya sebagai situs yang bertugas sebagai Bandar Poker Online pastinya akan berusaha untuk menjaga semua informasi dan keamanan yang terdapat di POKERQQ13. Kotakqq adalah situs Judi Poker Online Terpercayayang menyediakan 9 jenis permainan sakong online, dominoqq, domino99, bandarq, bandar ceme, aduq, poker online, bandar poker, balak66, perang baccarat, dan capsa susun. Dengan minimal deposit withdraw 15.000 Anda sudah bisa memainkan semua permaina pkv games di situs kami. Jackpot besar,Win rate tinggi, Fair play, PKV Games