Data for Exercise 9.9

Magnesiu

Format

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)