medpy.metric.histogram.correlate_1

medpy.metric.histogram.correlate_1(h1, h2)

Correlation distance.

Turns the histogram correlation into a distance measure for normalized, positive histograms.

\[d_{\bar{corr}}(H, H') = 1-\frac{d_{corr}(H, H')}{2}.\]

See correlate for the definition of \(d_{corr}(H, H')\).

Attributes:

• semimetric

Attributes for normalized histograms:

• \(d(H, H')\in[0, 1]\)

• \(d(H, H) = 0\)

• \(d(H, H') = d(H', H)\)

Attributes for not-normalized histograms:

• \(d(H, H')\in[0, 1]\)

• \(d(H, H) = 0\)

• \(d(H, H') = d(H', H)\)

Attributes for not-equal histograms:

• not applicable

Parameters:

h1sequence

The first histogram.

h2sequence

The second histogram, same bins as h1.

Returns:

correlatefloat

Correlation distnace between the histograms.

Notes

Returns 0.5 if one of h1 or h2 contains only zeros.