Zinc Data SPH 247 Statistical Analysis of Laboratory Data.

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Zinc Data SPH 247 Statistical Analysis of Laboratory Data

May 7, 2010SPH 247 Statistical Analysis of Laboratory Data 2 zinc <- read.delim("zinc.txt") > names(zinc) [1] "Concentration" "Peak.Area" > zinc.lm <- lm(Peak.Area ~ Concentration,data=zinc) > summary(zinc.lm) Call: lm(formula = Peak.Area ~ Concentration, data = zinc) Residuals: Min 1Q Median 3Q Max Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) Concentration <2e-16 *** --- Signif. codes: 0 ‘***’ ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 Residual standard error: 2201 on 89 degrees of freedom Multiple R-squared: , Adjusted R-squared: F-statistic: 5.512e+04 on 1 and 89 DF, p-value: < 2.2e-16 > plot(zinc$Concentration,zinc$Peak.Area) > abline(coef(zinc.lm)) > plot(fitted(zinc.lm),resid(zinc.lm)) > ( )/ [1]

May 7, 2010SPH 247 Statistical Analysis of Laboratory Data 3

May 7, 2010SPH 247 Statistical Analysis of Laboratory Data 4

May 7, 2010SPH 247 Statistical Analysis of Laboratory Data 5 > zinc[zinc$Concentration==0,] Concentration Peak.Area > mean(zinc[zinc$Concentration==0,2]) [1] > sd(zinc[zinc$Concentration==0,2]) [1] > * [1]