The urea:creatinine ratio in SI units

It is said that a high urea:creatinine ratio is an indicator of a pre-renal cause of acute kidney injury [1]. This is usually discussed in United States units, where urea is measured as blood urea nitrogen (BUN) in mg/dL, and creatinine in mg/dL. The… »

On the credible probability of confidence intervals

Confidence intervals are commonly misinterpreted by consumers of statistics. Hoekstra et al. [1] presented 120 psychology researchers and 442 students with ‘a fictitious scenario of a professor who conducts an experiment and reports a 95% CI for the mean that ranges from 0.1 to… »

Quasi-likelihood gamma regression in statsmodels for zeroes in observations

Generalised linear models with a gamma distribution and log link are frequently used to model non-negative right-skewed continuous data, such as costs [1].

For example, in statsmodels:

import numpy as np
import pandas as pd
from scipy import stats
import statsmodels.api as sm

#

Robust Poisson regression in medical biostatistics

Log-binomial and robust (modified) Poisson regression are common approaches to estimating risk ratios in medical biostatistics [1].

I have discussed log-binomial regression in a previous post about generalised linear models. The conceptual basis for using log-binomial regression to estimate risk ratios is straightforward –… »