Thread by @MaartenvSmeden

@Laconic_doc @statsmethods I think Alama has been called out by @GSCollins, I don't know about Public Health England.

Also, I actually never mentioned your name or link to your website to avoid public ridicule

@Laconic_doc @statsmethods @GSCollins That said, I have personally did quite a few things to warn you

First, I send you emails to which you politely and quickly responded. Thanks. You seemed to agree with my critique, but you didn't show any initiative to change it or remove the model

@Laconic_doc @statsmethods @GSCollins Second, I am one of the authors of a reply to the OpenSAFELY study where we specifically mention their model falls short of developing a risk model. You seem to have ignored that and used their multivariable results anyway

@Laconic_doc @statsmethods @GSCollins Third, I am the senior author on a living review on diagnostic and prognostic models for COVID. We have been warning about bad prognostic modeling since March. You seem to be familiar with the publication, but you didn't pick up on the modeling advice bmj.com/content/369/bm…

@Laconic_doc @statsmethods @GSCollins I don't know what more to do to stop models that are poorly developed and not validated to become publicly available or even used.

I'm sure you do not intend to do harm, but we know that bad prediction models *can* do harm, no matter how well intended they are