qq4res | R Documentation |

Producing a side-by-side QQ plot of the residuals against standard normal quantiles.

qq4res(object, xlabel = 'Theoretical Quantiles', ylabel = 'Residuals', lgd = NULL)

`object` |
object of class curveFit. |

`xlabel, ylabel` |
plot labels. |

`lgd` |
legend of the plot |

The empirical quantiles are plotted against the quantiles of a standard normal distribution. If the residuals are from a normal distribution with mean 0, the points tend to fall along the reference line that has an intercept of 0 and a slope equal to the estimated standard deviation.

## example 1 # x <- antibiotox$PAR$x expr <- antibiotox$PAR$y obj <- curveFit(x, expr, eq = 'Logit', rtype = 'quantal', param = c(26, 4), effv = c(0.05, 0.5)) qq4res(obj)

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