star                 package:mlmRev                 R Documentation

_S_t_u_d_e_n_t _T_e_a_c_h_e_r _A_c_h_i_e_v_m_e_n_t _R_a_t_i_o (_S_T_A_R) _p_r_o_j_e_c_t _d_a_t_a

_D_e_s_c_r_i_p_t_i_o_n:

     Data from Tennessee's Student Teacher Achievement Ratio (STAR)
     project which was  a large-scale, four-year study of the effect of
     reduced class size.

_U_s_a_g_e:

     data(star)

_F_o_r_m_a_t:

     A data frame with 26796 observations on the following 18
     variables.

     '_i_d' a factor - student id number

     '_s_c_h' a factor - school id number

     '_g_r' grade - an ordered factor with levels 'K' < '1' < '2' < '3' 

     '_c_l_t_y_p_e' class type - a factor with levels 'small', 'reg' and
          'reg+A'.  The last level indicates a regular class size with
          a teachers aide. 

     '_h_d_e_g' highest degree obtained by the teacher - an ordered factor
          with levels 'ASSOC' < 'BS/BA' < 'MS/MA/MEd' < 'MA+' < 'Ed.S'
          < 'Ed.D/Ph.D' 

     '_c_l_a_d' career ladder position of the teacher - a factor with
          levels 'NOT' 'APPR' 'PROB' 'PEND' '1' '2' '3' 

     '_e_x_p' a numeric vector - the total number of years of experience
          of the teacher

     '_t_r_a_c_e' teacher's race - a factor with levels 'W', 'B', 'A', 'H',
          'I' and 'O' representing white, black, Asian, Hispanic,
          Indian (Native American) and other

     '_r_e_a_d' the student's total reading scaled score

     '_m_a_t_h' the student's total math scaled score

     '_s_e_s' socioeconomic status - a factor with levels 'F' and 'N'
          representing eligible for free lunches or not eligible

     '_s_c_h_t_y_p_e' school type - a factor with levels 'inner', 'suburb',
          'rural' and 'urban'

     '_s_x' student's sex - a factor with levels 'M' 'F'

     '_e_t_h' student's ethnicity - a factor with the same levels as
          'trace'

     '_b_i_r_t_h_q' student's birth quarter - an ordered factor with levels
          '1977:1' < ... < '1982:2'

     '_b_i_r_t_h_y' student's birth year - an ordered factor with levels
          '1977:1982'

     '_y_r_s' number of years of schooling for the student - a numeric
          version of the grade 'gr' with Kindergarten represented as 0.
           This variable was generated from 'gr' and does not allow for
          a student being retained.

     '_t_c_h' a factor - teacher id number

_D_e_t_a_i_l_s:

     Details of the original data source and the process of conversion
     to this representation are given in the vignette.

_S_o_u_r_c_e:

     <URL: http://www.heros-inc.org/data.htm>

_E_x_a_m_p_l_e_s:

     str(star)

