GUIDES · BETSLIP DOCTOR
How should I compare last-five and last-ten averages without double-counting the interpretation?
The last-five appearances are included in the last-ten average, so those two summaries overlap. Comparing them does not compare two independent blocks of events. To describe a recent change, compare the latest five applicable appearances with the preceding five using the same numeric metric, unit, and inclusion rule. If all ten values are present, the ten-event mean combines the two five-event means equally; disclose missing values or unequal sample sizes before combining.
For Bettors and cappers interpreting sports-record evidence · Updated
Last five is inside last ten
The two windows share the latest five appearances. The last-ten average is a longer summary containing the recent-five sample, so the windows should not be described as separate periods. A difference between these two values does not equal the change from the preceding five to the latest five.
Use adjacent windows for recent change
For a recent-versus-prior comparison, define the latest five applicable appearances and the preceding five, then apply the same metric, units, cutoff, and missing-value rule. With five valid numeric observations in each block, mean10 = (5 × mean_recent5 + 5 × mean_prior5) / 10. If counts differ or values are missing, recompute from the underlying observations and disclose each sample; do not average two means as if their sample sizes were equal.
Hypothetical overlapping-window check
In a hypothetical worksheet, let R be the average for the latest five observations and P the average for the preceding five. If all ten applicable numeric values exist, the last-ten average is (R + P) / 2. R and the last-ten average overlap; R versus P compares adjacent windows. The symbols are not sports data.
Related questions
Is comparing last five with last ten the same as comparing last five with the prior five?
No. Last ten includes the recent five. Use the preceding five as a separate adjacent window when the goal is to compare two periods.