Airq                  package:Ecdat                  R Documentation

_A_i_r _Q_u_a_l_i_t_y _f_o_r _C_a_l_i_f_o_r_n_i_a_n _M_e_t_r_o_p_o_l_i_t_a_n _A_r_e_a_s

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

     a cross-section from 1972

     _number of observations_ :  30

     _observation_ :  regional

     _country_ :  United States

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

     data(Airq)

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

     A dataframe containing :

     _a_i_r_q indicator of air quality (the lower the better)

     _v_a_l_a value added of companies (in thousands of dollars)

     _r_a_i_n amount of rain (in inches)

     _c_o_a_s is it a coastal area ? 

     _d_e_n_s population density (per square mile)

     _m_e_d_i average income per head (in US dollars)

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

     Verbeek, Marno (2004) _A guide to modern econometrics_, John Wiley
     and Sons, <URL: http://www.econ.kuleuven.ac.be/GME>.

_S_e_e _A_l_s_o:

     'Index.Books', 'Index.Economics', 'Index.Econometrics',
     'Index.Observations'

