Before interpreting summer and winter deviations, check whether run and record coverage in the periods can be compared.
Conditions for comparison
- Route: match the same lines; do not rely on fleet totals alone.
- Regime: examine product and temperature regimes separately.
- Run: record differences in length, stop count and load.
- Records: report eligible runs and missing measurements by period.
Outside temperature
Add outside temperature with its date and source to the run record; it is a related variable, not proof of cause.
Read the rate and coverage. Divide eligible runs with deviations by all eligible runs under the same conditions; show the raw count too, and avoid equipment conclusions while coverage or conditions differ.
Review winter records too
Report relevant lower and upper limit findings separately according to product requirements; season alone is not a safe product decision.
Matched conditions strengthen comparison :: Keep denominators, record coverage and changing conditions visible when interpreting a difference.
Tie planning to evidence
Write down the line to monitor, measure and review date; operational and product decisions depend on site procedure and authorized quality review.
Transition periods
Show spring and autumn separately or group them into predefined outside temperature bands; state which rule you used.
