Akshat Dwivedi

Sampling from the poor man’s posterior distribution of parameters from models fitted to claims data

Bayesian

Bootstrap

GLM

Insurance

R

Tweedie

This post is about fitting a handful of different models to a subset of a popular car-insurance claims data available online. Plausible future data values can be simulated…

Simulating data from a time-to-event experiment with non-proportional hazards, random censoring, and cure

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Experimentation

R

Simulation

Time-to-event

This post is about simulating data from a log-logistic accelerated failure time mixture cure model with censoring. It also visually compares the estimated cumulative…

Scrollable box for long math equations on mobile

Quarto

While writing new posts, I preview them on (Google) Chrome on my laptop before publishing. The three people who read my blog posts usually read them on mobile. So one fine…

Using an obscure causal inference method to estimate treatment effects with the help of another less obscure causal inference method

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Causal Inference

Experimentation

Instrumental Variables

G-estimation

G-computation

GEE

R

In a previous post, I used the ratio estimator and the method of instrumental variables (IV) to estimate the effect of showing an ad on sales from a fictitious ad campaign.

Setup and test Python by programming a spelling bee solver

Python

All the previous posts on this blog have been in R. But sometimes I want to program in another language – Python, Scala, etc. So in the process of setting up and testing…

How should the untreated in the treatment group from an experiment be analyzed?

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Causal Inference

Instrumental Variables

R

This (longer-than-expected) post compares intention-to-treat, per-protocol, as-treated, and instrumental variable analyses on a simulated dataset. Along the way, it goes off…

Specifying an offset in a Tweedie model with identity link

R

Tweedie

Offset

This post explores several things:

One reason why a (g)lm coefficient is NA

R

GLM

Multicollinearity

TL;DR: Use the alias function in R to check if you have nested factors (predictors) in your data

GEE on aggregated data?

R

GLM

GEE

TL;DR: The geepack R package doesn’t do what it doesn’t claim to do

Determining the volume of my (cocktail) jigger

Miscellaneous

Measurement

R

In the fall of 2022, I was gifted a cocktail mixing set for my birthday¹ which included a cocktail jigger. A jigger is an essential tool for mixing cocktails as it makes it…

How Many Five-Star Ratings Do I Need?

Analysis

Miscellaneous

R

In the fall of 2021, a friend who runs her own business sent me this picture with the accompanying question:

Hello, World!

Miscellaneous

This first post is to check whether the features I want for this blog work as desired.