chloride                package:alr3                R Documentation

_C_h_l_o_r_i_d_e _d_a_t_a

_D_e_s_c_r_i_p_t_i_o_n:

     Seasonal variation in chloride level in marshes close to a road or
     distant from the road, in Minnesota.

_U_s_a_g_e:

     data(chloride)

_F_o_r_m_a_t:

     A data frame with 32 observations on the following 4 variables.

     _M_a_r_s_h March number

     _T_y_p_e a factor with levels 'Isolated' and 'Roadside'

     _M_o_n_t_h Month (4 = May, ... 10 = October)

     _C_l Chloride concentration, mg/liter

_S_o_u_r_c_e:

     Stefanie Miklovic and Susan Galatowitsch

_R_e_f_e_r_e_n_c_e_s:

     Weisberg, S. (2005). _Applied Linnear Regression_, 3rd edition.
     New York: Wiley, Section 6.5.

_E_x_a_m_p_l_e_s:

     data(chloride)
     library(nlme) # Use the mixed-effects package
     # Fit a random coefficients model
     summary(m1 <- lme(Cl~Month+Type, data=chloride, random=~1|Marsh))

