From counts to density.
A count tells you how many lifetimes fall in a bin. To compare measurements, account for how much area you sampled—and how wide the bin is.
Synthetic teaching example
COUNT → BIN MASS → DENSITY
Two divisions. Different meanings.
Bin mass per unit area0.5
Density per unit area and lifetime0.153846
- Bin width b − a
- 3.25
- Total sampled area 576 × m
- 1152
576 ÷ 1152 = 0.5; 0.5 ÷ 3.25 ≈ 0.153846
Density is the average height of a histogram bar: density × bin width = bin mass. Displayed calculations use approximate browser arithmetic.
576 synthetic counts across 2 realizations give a bin mass of 0.5 per unit area. Dividing by the width gives a density of approximately 0.153846.
Try a wider bin with the same synthetic count: mass stays the same and density falls. This holds N and m fixed to explain the arithmetic. Rebinning real data can change N.
These inputs are invented. This example generates no random field, fits no coefficient and validates no theorem.
The exact worked example
Start with N = 576 and m = 2 in the bin [1/8, 27/8). Its width is 13/4. The bin mass is 576/(576 × 2) = 1/2, and the density is (1/2)/(13/4) = 2/13. These fractions describe the default example, whatever values you try above.
Read the measurement protocol and its limits
Measuring finite H₀ lifetimes on the SIDE24 torus, §1 ↗
The protocol counts strictly positive finite lifetimes in an ordinary superlevel filtration. Essential intervals and zero-lifetime ties are separate diagnostics. For m independent realizations, N is the sum of their bin counts. In two dimensions, divide by m × 24² to obtain bin mass per unit area, then by b − a to obtain a density estimate.
Dividing by the total number of bars instead would produce a different, normalized distribution. Dropping zero-count realizations would also change the measurement. An aggregate count alone does not supply uncertainty: bars within one field are dependent, so sampling intervals need independent realizations as replicates.
This calculator illustrates that reporting rule with synthetic inputs. It supplies no data, confidence interval, lifetime cutoff, fitted asymptotic or continuum certificate. A compact birth/gap or pair-Palm experiment uses a different design and normalizer.
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