Hookworm 1993            package:epicalc            R Documentation

_D_a_t_a_s_e_t _f_r_o_m _a _s_t_u_d_y _o_n _h_o_o_k_w_o_r_m _p_r_e_v_a_l_e_n_c_e _a_n_d _i_n_t_e_n_s_i_t_y _i_n _1_9_9_3

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

     A dataset from a cross-sectional survey in 1993 examining hookworm
     infection

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

     data(HW93)

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

     A data frame with 637 observations on the following 6 variables.

     '_i_d' a numeric vector for personal identification number

     '_e_p_g' a numeric vector for eggs per gram of faeces

     '_a_g_e' a numeric vector for age in years

     '_s_h_o_e_s' a factor for shoe wearing with levels 'no' 'yes'

     '_i_n_t_e_n_s_e' a factor for intensity of infection in epg. with levels
          '0' '1-1,999' '2,000+'

     '_a_g_e_g_r' a factor for age group with levels '<15 yrs' '15-59 yrs'
          '60+ yrs'

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

     data(HW93)
     library(MASS)
     use(HW93)
     intense.ord <- ordered(intense)
     ord.hw <- polr(intense.ord ~ agegr + shoes)
     summary(ord.hw)

