What is a Consulting Statistician?

I am often asked, “What does a consulting statistician do?” My answer is the same now as it was decades ago when I began that work, “Whatever the client needs.”

“John Tukey, one of the most influential figures in modern Statistics, commented that being a statistician means one gets to play in everyone else’s backyard. My corollary is that we can play in the front yard, too.”

Consulting statisticians don’t simply “run analyses” or “interpret data.” We live at the intersection of data, decisions, and doubt. We help ask the right questions, design studies to answer them, and interpret results with intellectual honesty. Statistics is a way of thinking, of distinguishing signal from noise; it is not just a toolbox. Statistics is a voice of reason that says, “No, that methodology is not appropriate.”

Consider these phrases: scientific method, critical appraisal, evidence-based medicine. All rely on Statistics. 

Statisticians are the de facto keeper of the scientific method. Every stage of research—formulating hypotheses, designing experiments, collecting data, analyzing results, and drawing conclusions—depends on statistical reasoning. A consulting statistician maintains this chain.

This role extends naturally into critical appraisal. In an era saturated with studies, reports, claims, and shoddy research practices, statisticians are careful readers of evidence. Consulting statisticians not only analyze new data but evaluate existing research. By acting as both analysts and skeptics, they help clients avoid common pitfalls such as overinterpretation, confounding, and misuse of p-values.

This is particularly consequential in evidence-based medicine. Clinical trials, observational studies, and health policy decisions all rely on statistical methods to determine what treatments work, for whom, and under what conditions. Consulting statisticians provide clarity, translating complex results into trustworthy conclusions for clinicians, policymakers, and patients.

Consulting statisticians work in nearly every field of human endeavour and inquiry—healthcare and life sciences, business and industry, government and social science, sports and entertainment, technology and engineering, education, et cetera. In a data-centric world, questions need quantitative answers. We use our statistical expertise to assist in making decisions in the face of uncertainty.

So, what specifically can a consulting statistician assist with? Grant proposals, experimental design, survey design, sampling methodology, outcome measures, data collection processes, data quality checks, data analysis, interpretation of results, manuscript writing, peer review process.

The consulting statistician is not the final word, but an essential voice in ensuring that conclusions are grounded in evidence, methods are sound, and decisions are informed rather than assumed.