Data for Exercise 9.9
MagnesiuFormat
A data frame/tibble with 20 observations on two variables
- distance
distance between samples
- magnesium
concentration of magnesium
Source
Davis, J. (1986), Statistics and Data Analysis in Geology, 2d. Ed., John Wiley and Sons, New York, p. 146.
References
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
Examples
plot(magnesium ~ distance, data = Magnesiu)
model = lm(magnesium ~ distance, data = Magnesiu)
abline(model, col = "red")
summary(model)
#>
#> Call:
#> lm(formula = magnesium ~ distance, data = Magnesiu)
#>
#> Residuals:
#> Min 1Q Median 3Q Max
#> -1.5453 -0.7039 0.1234 0.6766 3.3006
#>
#> Coefficients:
#> Estimate Std. Error t value Pr(>|t|)
#> (Intercept) 5.768e+00 4.952e-01 11.647 8.15e-10 ***
#> distance -2.518e-04 4.027e-05 -6.254 6.73e-06 ***
#> ---
#> Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1
#>
#> Residual standard error: 1.195 on 18 degrees of freedom
#> Multiple R-squared: 0.6848, Adjusted R-squared: 0.6673
#> F-statistic: 39.11 on 1 and 18 DF, p-value: 6.73e-06
#>
rm(model)