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# estimate

Estimate approximate-index parameters (z, evidence bits, false-positive rate) before building an index with `--approx`, without touching any files.

    obikmer estimate [OPTIONS]

## Options

Option | Default | Description
--- | --- | ---
`-k, --kmer-size` | `31` | Kmer size used at query time (matches `index`'s `--kmer-size`)
`-z, --findere-z` | none | Findere z parameter
`--evidence-bits` | none | Fingerprint bits per slot (b)
`--fp` | none | Target false-positive rate per z-window

Any two of `-z`, `--evidence-bits`, `--fp` may be given; the third is derived using the same model as `index --approx` and `reindex --approx` (\(FP = 1 / 2^{b \cdot z}\)). The report printed to stdout includes: query \(k\), effective indexed \(k\) (\(k-z+1\)), \(z\), evidence bits, per-kmer false-positive rate, and per-z-window false-positive rate.