CHRONOGRAPH
Chronic pain tracker
On-device

Setup

Daily reminder

no app needed

Daily check‑in

NoneWorst
+ Add a custom factor to track

Mood

LowBaselineHigh
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Your log

Not enough data yet

How each factor affects your pain

FactorEffectImpact / SDStrengthrConf.

What do these columns mean?

Effect: whether more of this factor tends to raise or lower pain, from a multi‑factor regression (controls for the others).
Impact / SD: pain points (0–10 scale) change for a 1 standard‑deviation change in the factor — a fair way to compare units.
Strength: random‑forest permutation importance — how much the model relies on this factor, capturing non‑linear effects.
r: simple pairwise correlation with pain.
Conf.: our confidence, blending statistical significance, agreement between models, forest importance and how much data you have.

How "Delayed effects" works

Same‑day analysis misses anything that hits with a delay (post‑exertional crashes, migraine build‑up). A separate pass checks each factor a few days back, after controlling for your own recent trend, so a slow drift isn't mistaken for a driver. A confound note appears when two factors move together closely enough that we can't confidently credit one over the other from observation alone.

Pattern structure (PCA)

How your habits cluster, and how much of the day‑to‑day variation a few patterns capture.

Model quality

honest hedging
regression R²
forest R² (out‑of‑bag)
days analysed

Not enough data yet

Log ~15 days to unlock experiments.

Cycle tracker

any condition
Log a different date

Medications

tracked, never auto-tested
+ Add a medication

Adherence