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A reading archive: what changed, and why

8 articles

The Fourteen-Day Average: What It Can and Cannot Say

Read it as a specimen, not a diagnosis. Every field below is the kind of thing a symptom log or sleep tracker exports, and each one behaves differently when averaged.

Correlation in a Personal Log and Why It Misleads

The practical value of a personal log lies in the questions it raises for a clinician or a lab panel to examine, not in the conclusions it appears to offer on its own.

5 Questions That Reveal a Study's Sample Size Problem

Headlines rarely mention how many people were studied, yet that number shapes every conclusion. A trial of 40 and a trial of 40,000 cannot support the same claim. These five checks help separate a…

The clock face as a chart axis: time-of-day measurement in health tracking

Most people who log health data at all log it against a calendar. Weight on Monday, glucose after breakfast, steps at bedtime. That convention is convenient, but it quietly assumes that the hour a…

Changing Three Habits at Once and Learning Nothing

The right-branch alternative is not complicated. It is simply ordered.

Why Walking After Eating Appears in So Many Studies

Why it matters: the post-meal period is one of the few windows where a simple change in body position and movement shows up on a measurable curve, which is exactly the kind of signal that generates…

What Reference Ranges Describe and Who Sets Them

A laboratory result arrives with a number, a unit, and a bracket of values printed beside it. That bracket is rarely explained, yet it shapes how results are read, filed, and acted upon. Reference…

6 Ways Cold Weather Changes Movement Routines, and Indoor Substitutes Explored

Cold itself is rarely the deciding factor. A step counter usually shows the drop beginning weeks before the coldest weather arrives, when daylight disappears from the commute and leisure walks lose…