> data(pbr28)
> pbr28$jsondata
NULL
Warning message:
Unknown or uninitialised column: `jsondata`.

The package kinfitr has changed since you posted the piece? Still very useful.

Hi Peter,

Sorry about this: the package has indeed been updated, and I've been meaning to update the blog. The blog theme has also updated, so I can't update the blog post unless I update everything in the blog, and that requires more time than I've had.

The fix is to use the following instead for that particular block:

pfdat <- pbr28 %>%
mutate(pf = map(blooddata, ~bd_extract(.x, "parentFraction"))) %>%
select(PET, Subjname, PETNo, Genotype, pf)

Hope this helps!!
/G

Could you suggest how to include measurement errors on data points along both axis into the calculation of all the three methods? In brms, I read that it is not possible to include measurement errors into non-linear models.