asphalt                package:interactionPlot                R Documentation

_I_n_t_e_r_a_c_t_i_o_n_ _P_l_o_t _o_f_ _A_s_p_h_a_l_t_ _D_a_t_a

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

     data(asphalt)

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

     Damage to road surfaces made with asphalt is caused by water getting into cracks.
     Vibrations cause the cracks from cars and trucks and by earth movements. The
     surfaces are weakened when there is a break in the bond between the aggregate
     base and the asphalt and concrete in the surface. Engineers try to find ways to
     improve the strength of the bond. Two factors known to have an effect on bond
     strength are:
          i) The method used to compact the aggregate base, and
         ii) The type of aggregate used.
     
     The tensile Strength (measured in pounds / square inch) of 3 samples of road
     surface was tested at each of two levels of Aggregate type, Basalt and Silicious
     and four Compaction methods.

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

     University of Auckland, New Zealand, Statistics Paper 475.340FC 2000.
     Assignment 3 Question 2.

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

     library(interactionPlot)
     data(asphalt)
     interaction.plot( Aggregate, Compaction, Strength,
                       main = "Effect of Compaction Method against Aggregate Type" )

     interaction.plot( Compaction, Aggregate, Strength,
                       main = "Effect of Aggregate Type against Compaction Method" )


