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Is the eROSITA S8–redshift trend dominated by a single bin?
Public summary of an internal test, not yet independently validated or published.
Question investigated
Is the eROSITA S8–redshift trend dominated by a single bin?
Test conditions
Estimate the slope of the S8 trend and repeat the fit after excluding each of the five redshift bins in turn. Use the diagonal errors of the published summaries and compare the slope and its significance across the fits.
Result
Excluding the highest-redshift bin reduces the nominal slope significance from 2.18σ to 0.35σ. The trend is therefore sensitive to that bin in the fit to published summaries; these values are not a global significance corrected for multiple testing.
Key figure
Nominal slope significance (σ)
- All bins
- 2.18 σ
- Highest-redshift bin removed
- 0.35 σ
Source: Tower public snapshot
Specific limitations
- This is a retrospective influence diagnostic for the five published bins, using only diagonal errors. The resulting significance includes no multiple-testing correction and does not identify a physical cause.
- The values give the nominal significance of the S8–redshift slope, calculated from published summaries and diagonal errors. They are not S8 measurements, do not provide a global significance corrected for multiple testing, and do not identify the cause of the sensitivity.