The Detection of Host Variability in a Dilution Series with Single Observations

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Abstract
A new statistic, J = the number of positive responses after the first negative in a dilution series, is introduced. Its ability to detect host variability in a 2 fold dilution series is compared to another statistic, R = the number of dilutions between (and including) the first negative and the last positive responses. For small departures from the null hypothesis (no host variability) statistic J has greater detecting ability than R. For great departures from the null hypothesis the J-test appears to have lost its advantage.