Bio-Rad Microplate Manager Software - Manual (Page 46)

Analyzing Data Using a Standard Curve
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The 4-parameter method is usually preferred over the Log/Logit method, because the
results for the 4-parameter method are more accurate.
In both the Log/Logit and the 4-Parameter plots, the concentration axes are displayed
on the log scale. The parameters A, B, C, D, the chi
2 values of the standard curve are
shown below the plot.