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drizopoulos / GLMMadaptive

GLMMs with adaptive Gaussian quadrature
https://drizopoulos.github.io/GLMMadaptive/
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weights in mixed_model()? #6

Closed strengejacke closed 5 years ago

strengejacke commented 5 years ago

Is it possible to use weights in mixed_model()? I haven't found anything in the help files.

drizopoulos commented 5 years ago

No, weights have not been implemented yet. Do you want to use them for specific purposes?

On 1/21/2019 5:54 PM, Daniel wrote:

Is it possible to use weights in |mixed_model()|? I haven't found anything in the help files.

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strengejacke commented 5 years ago

Sometimes, e.g. in case of panel attrition, we use response propensity weights in our models. Or in case of analyzing survey-data, you may have a weighting-variable that can be used in standard regression or mixed models, without the need for a specific survey design.

strengejacke commented 5 years ago

Two surveys come to my mind where weights are required, e.g. when using mixed models to analyse the data: European Social Survey and German Ageing Survey.

Would you say it's difficult to implement such a feature?

drizopoulos commented 5 years ago

A weights argument has been added in mixed_model(). These are simple multipliers on the log-likelihood contributions of each group/cluster, i.e., we presume that there are multiple replicates of each group/cluster denoted by the weights.

strengejacke commented 5 years ago

btw, you have changed the structure of how the model frames (like x$model_frames$mfX_zi) are saved in MixMod-objects with the last update? Is there a reason for this?

drizopoulos commented 5 years ago

Yes, because I’m working on the extension to nested random effects.

From: Daniel notifications@github.com Sent: Friday, June 28, 2019 11:57 AM To: drizopoulos/GLMMadaptive GLMMadaptive@noreply.github.com Cc: D. Rizopoulos d.rizopoulos@erasmusmc.nl; State change state_change@noreply.github.com Subject: Re: [drizopoulos/GLMMadaptive] weights in mixed_model()? (#6)

btw, you have changed the structure of how the model frames (like x$model_frames$mfX_zi) are saved in MixMod-objects with the last update? Is there a reason for this?

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strengejacke commented 5 years ago

ok, thanks! It broke the insight pkg on CRAN, but the issue is already fixed and I'm planning to submit soon.