In this blog, I will provide a step-by-step instruction of how we can generate data from a mixed effect model and recover the parameters of the model with the simulated dataset. This simulation-based experiment can help us better understand the structure and generative process of the multilevel model with correlated…
The purrr package provides us a set of convenient functions (e.g., map, map_lgl, map_chr, map_int, and map_dbl) to manipulate each element in a list in R. The map function in purrr package can be considered as an alternative to for loops or lapply function, and can be easily integrated with…
Lewandowski-Kurowicka-Joe (LKJ) distribution is a very useful prior distribution for parameter estimation in correlation matrices, and is also tightly related to matrix factorizations such as Cholesky decomposition. …
With the development of dplyr or its umbrella package tidyverse, it becomes quite straightforward to perform operations over columns or rows in R. These column- or row-wise methods can also be directly integrated with other dplyr verbs like select, mutate, filter and summarise, making them more comparable with other functions…
I am looking for a general-purpose editor that can integrate and customize different features across all programming languages that I often use (e.g., R, Python, Julia and Javascript), and Visual Studio Code seems to be the best candidate for me. Here I will give a quick overview of the key…
This post provides an example of simulating data in a Multivariate Normal distribution with given parameters, and estimating the parameters based on the simulated data via Cholesky decomposition in stan. Multivariate Normal distribution is a commonly used distribution in various regression models and machine learning tasks. It generalizes the Normal…
It takes a while for me to figure out how you can preview pictures and pdfs in vifm on Kitty terminal. …
A good terminal tool can speed up your workflow, and make your life much easier. Here I give a complete tutorial of installing the kitty terminal, and configuring the fish shell and vifm manager on mac.
- kitty
(1) install kitty on mac
>> curl -L https://sw.kovidgoyal.net/kitty/installer.sh | sh /dev/stdin(2)…
PyTorch has gained great popularity among industrial and scientific projects, and it provides a backend for many other packages or modules. It is also accompanied with very good documentation, tutorials, and conferences. This blog attempts to use PyTorch to fit a simple linear regression via three optimisation algorithms:
- Stochastic Gradient…
