rstanarm | rstanarm R package for Bayesian applied regression modeling | Analytics library
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kandi X-RAY | rstanarm Summary
rstanarm R package for Bayesian applied regression modeling
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QUESTION
I am using rstanarm and want to create priors that are bound to be positive, so lower>0. How can I do this?
...ANSWER
Answered 2021-Oct-07 at 15:02That is not currently possible with the rstanarm package. It is possible if you use the brms package or write your own Stan code.
QUESTION
I would like to perform Bayesian Logistic Regression using the bayestestR
and rstanarm
in R. The output, I believe, is in the log(odds ratio). Do you know of a way in which I can convert everything, i.e. the centrality, uncertainty, existence and significance indices into odds ratio instead. I know tbl_summary
function from gtsummary
package has an argument, exponentiate = TRUE
that returns everything in OR.
Code:
...ANSWER
Answered 2021-Jun-29 at 12:23I'd recommend using the parameters
package which uses bayestestR internally but is more flexible:
QUESTION
I am trying to run GLM function of rstanarm library. I am using rpy2 library to connect python with R packages. Following is the code:
...ANSWER
Answered 2021-Jan-21 at 14:47browseURL()
is an R function trying to open a web browser to show the content at an URL. The GCP AI notebook is running on the cloud, and the system it runs on probably does not have a web browser set.
You'll need to find a way to call the R function stan_glm()
in a way that does not make it require a web browser.
QUESTION
I am making the convergence graph of the chains generated using the traceplot function. However, see what unusual lines are appearing on the chart. How would you go about removing them?
data: https://drive.google.com/file/d/1iOuGbjNI_caLWBIz4s7hZX5GlfhLrwr9/view?usp=sharing
Below are the codes.
...ANSWER
Answered 2021-Jan-28 at 23:21By setting col="black"
you have removed the information ggplot needs to keep the traces for each chain separate. Adding aes(group=chain)
as below appears to work (although I would consider whether you really want to make the chains indistinguishable from each other: part of the point of showing a trace plot is to verify that the different chains have similar behaviour ...)
QUESTION
I'm currently trying to fit a Bayesian multilevel model using rstanarm. I expect - and there's evidence in literature - that the coefficient of my main predictor lies between 0.15 and 0.65. Therefore, I'd like to set an informative prior but only for this variable and keeping the weakly informative default for the others. Up to now I have:
...ANSWER
Answered 2021-Jan-13 at 03:50Yes, it is but you need to pass a vector of prior locations and / or scales whose size(s) are equal to the number of coefficients (excluding the intercept). So, in your example it might be something like:
QUESTION
I am trying to obtain a prediction grid using the modelr::data_grid()
function that has all levels for one factor of a model and only the "typical" level for the other factor in a model. The wrinkle is that the call levels()
on the factor held constant in the prediction grid should return all levels present in the original data. Otherwise, some prediction functions can fail and return the infamous
ANSWER
Answered 2020-Oct-29 at 15:06The problem is that the .
inside the across is the actual column not the name of the column. Sadly there is no way to get the names inside an across
call however using purrr::reduce
we can make a workaround:
QUESTION
I am creating a table with tab_model
from the package sjPlot
(https://cran.r-project.org/web/packages/sjPlot/vignettes/tab_model_estimates.html).
However, when I use a negative binomial rstanarm
model object, tab_model
re-runs MCMC chains.
My actual model takes many hours to run, so this is not ideal for tab_model
to be doing this, but it doesn't seem to do it for other models (such as with glmer
in lme4
).
ANSWER
Answered 2020-Oct-14 at 00:22tl;dr I think this is going to be hard to avoid without hacking both the insight
package and this one, or asking the package maintainer for an edit, unless you want to forgo printing the ICC, R^2, and the random-effects variance. Here, tab_model()
calls insight::get_variance()
, which tries to compute variances for the null model so it can compute the ICC and R^2. Computing these variances requires re-running the model. (When it does it for the glmer.nb
, it goes via lme4:::update.merMod()
and is quick enough that you don't notice the computation time.)
So
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