Iowa                 package:lasso2                 R Documentation

_T_h_e _I_o_w_a _W_h_e_a_t _Y_i_e_l_d _D_a_t_a

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

     The data gives the pre-season and three growing months'
     precipitation, the mean temperatures for the three growing months
     and harvest month, the year, and the yield of wheat for the USA
     state of Iowa, for the years 1930-1962.

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

     data(Iowa)

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

     The data frame has the following components:

     '_Y_e_a_r' Year of measurement (surrogate for variety improvements)

     '_R_a_i_n_0' Pre-season rainfall (in.)

     '_T_e_m_p_1' Mean temperature for the first growing month (deg. F)

     '_R_a_i_n_1' Rainfall for the first growing month (in.)

     '_T_e_m_p_2' Mean temperature for the second growing month (deg. F)

     '_R_a_i_n_2' Rainfall for the second growing month (in.)

     '_T_e_m_p_3' Mean temperature for the third growing month (deg. F)

     '_R_a_i_n_3' Rainfall for the third growing month (in.)

     '_T_e_m_p_4' Mean temperature for the harvest month (deg. F)

     '_Y_i_e_l_d' Yield of wheat in Iowa for the given year (bush./acre)

_C_A_T_E_G_O_R_Y:

     Multiple regression; diagnostics.

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

     CAED Report, 1964.  Quoted in Draper and Smith, Applied Regression
     Analysis.

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

     data(Iowa)
     pairs(Iowa)

