java - What does "biased" mean in "Metrics" histogram -

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one of properties codahale's "metrics" received "biased".
can explain mean?

public histogram newhistogram(class<?> klass,                      string name,                      boolean biased) creates new histogram , registers under given class , name. parameters: klass - class owns metric name - name of metric biased - whether or not histogram should biased returns: new histogram

when in doubt, @ source:

    /**      * uses exponentially decaying sample of 1028 elements, offers 99.9% confidence      * level 5% margin of error assuming normal distribution, , alpha factor of      * 0.015, heavily biases sample past 5 minutes of measurements.      */     biased {         @override         public sample newsample() {             return new exponentiallydecayingsample(default_sample_size, default_alpha);         }     };

a biased histogram 1 gives more weight more recent measurements.


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