type
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an optional character string specifying the type of
residuals to be used. If "response" , the "raw" residuals
(observed - fitted) are used; else, if "pearson" , the
standardized residuals (raw residuals divided by the corresponding
standard errors) are used; else, if "normalized" , the
normalized residuals (standardized residuals pre-multiplied by the
inverse square-root factor of the estimated error correlation
matrix) are used. Partial matching of arguments is used, so only the
first character needs to be provided. Defaults to "pearson" .
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