unionDensity              package:pscl              R Documentation

_c_r_o_s_s _n_a_t_i_o_n_a_l _r_a_t_e_s _o_f _t_r_a_d_e _u_n_i_o_n _d_e_n_s_i_t_y

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

     Cross-national data on relative size of the trade unions and
     predictors, in 20 countries.  Two of the predictors are highly
     collinear, and are the source of a debate between Stephens and
     Wallerstein (1991), later reviewed by Western and Jackman (1994).

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

     data(unionDensity)

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

   '_u_n_i_o_n' numeric, percentage of the total number of wage and salary
        earners plus the unemployed who are union members, measured
        between 1975 and 1980, with most of the data drawn from 1979

   '_l_e_f_t' numeric, an index tapping the extent to which parties of the
        left have controlled governments since 1919, due to Wilensky
        (1981).

   '_s_i_z_e' numeric, log of labor force size, defined as the number of
        wage and salary earners, plus the unemployed

   '_c_o_n_c_e_n' numeric, percentage of employment, shipments, or production
        accounted for by the four largest enterprises in a particular
        industry, averaged over industries (with weights proportional
        to the size of the industry) and the resulting measure is
        normalized such that the United States scores a 1.0, and is due
        to Pryor (1973). Some of the scores on this variable are
        imputed using procedures described in Stephens and Wallerstein
        (1991, 945).

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

     Pryor, Frederic. 1973. _Property and Industrial Organization in
     Communist and Capitalist Countries_. Bloomington: Indiana
     University Press.  

     Stephens, John and Michael Wallerstein. 1991. Industrial
     Concentration, Country Size and Trade Union Membership. _American
     Political Science Review_ 85:941-953.

     Western, Bruce and Simon Jackman. 1994. Bayesian Inference for
     Comparative Research.  _American Political Science Review_
     88:412-423. 

     Wilensky, Harold L. 1981. Leftism, Catholicism, Democratic
     Corporatism: The Role of Political Parties in Recemt Welfare State
     Development. In _The Development of Welfare States in Europe and
     America_, ed. Peter Flora and Arnold J. Heidenheimer. New
     Brunswick: Transaction Books.

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

     data(unionDensity)
     summary(unionDensity)
     pairs(unionDensity,
           labels=c("Union\nDensity",
             "Left\nGovernment",
             "log Size of\nLabor Force",
             "Economic\nConcentration"),
           lower.panel=function(x,y,digits=2){
             r <- cor(x,y)
             par(usr=c(0,1,0,1))
             text(.5,.5,
                  format(c(r,0.123456789),digits=digits)[1],
                  cex=1.5)
           }
           )
     ols <- lm(union ~ left + size + concen,
               data=unionDensity)
     summary(ols)

