Formaldehyde            package:datasets            R Documentation

_D_e_t_e_r_m_i_n_a_t_i_o_n _o_f _F_o_r_m_a_l_d_e_h_y_d_e

_D_e_s_c_r_i_p_t_i_o_n:

     These data are from a chemical experiment to prepare a standard
     curve for the determination of formaldehyde by the addition of
     chromatropic acid and concentrated sulpuric acid and the reading
     of the resulting purple color on a spectrophotometer.

_U_s_a_g_e:

     Formaldehyde

_F_o_r_m_a_t:

     A data frame with 6 observations on 2 variables.

       [,1]  carb    numeric  Carbohydrate (ml)
       [,2]  optden  numeric  Optical Density

_S_o_u_r_c_e:

     Bennett, N. A. and N. L. Franklin (1954) _Statistical Analysis in
     Chemistry and the Chemical Industry_. New York: Wiley.

_R_e_f_e_r_e_n_c_e_s:

     McNeil, D. R. (1977) _Interactive Data Analysis._ New York: Wiley.

_E_x_a_m_p_l_e_s:

     require(stats); require(graphics)
     plot(optden ~ carb, data = Formaldehyde,
          xlab = "Carbohydrate (ml)", ylab = "Optical Density",
          main = "Formaldehyde data", col = 4, las = 1)
     abline(fm1 <- lm(optden ~ carb, data = Formaldehyde))
     summary(fm1)
     opar <- par(mfrow = c(2,2), oma = c(0, 0, 1.1, 0))
     plot(fm1)
     par(opar)