plasma                 package:HSAUR                 R Documentation

_B_l_o_o_d _S_c_r_e_e_n_i_n_g _D_a_t_a

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

     The erythrocyte sedimentation rate and measurements of  two plasma
     proteins (fibrinogen and globulin).

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

     data("plasma")

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

     A data frame with 32 observations on the following 3 variables.

     '_f_i_b_r_i_n_o_g_e_n' the fibrinogen level in the blood.

     '_g_l_o_b_u_l_i_n' the globulin level in the blood.

     '_E_S_R' the erythrocyte sedimentation rate, either less or greater
          20 mm / hour. 

_D_e_t_a_i_l_s:

     The erythrocyte sedimentation rate (ESR) is the rate at which red
     blood cells (erythrocytes) settle out of suspension in blood
     plasma, when measured under standard conditions. If the ESR
     increases when the level of certain proteins in the blood plasma
     rise in association with conditions such as rheumatic diseases,
     chronic infections and malignant diseases, its determination might
     be useful in screening blood samples taken form people suspected
     to being suffering from one of the conditions mentioned. The
     absolute value of the ESR is not of great importance rather it is
     whether it is less than 20mm/hr since lower values indicate a
     healthy individual.

     The question of interest is whether there is any association  
     between the probability of an ESR reading greater than 20mm/hr and
     the levels of the two plasma proteins. If there is not then  the
     determination of ESR would not be useful for diagnostic purposes.

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

     D. Collett and A. A. Jemain (1985),  Residuals, outliers and
     influential observations in regression analysis. _Sains
     Malaysiana_, *4*, 493-511.

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

       data("plasma", package = "HSAUR")
       layout(matrix(1:2, ncol = 2))
       boxplot(fibrinogen ~ ESR, data = plasma, varwidth = TRUE)
       boxplot(globulin ~ ESR, data = plasma, varwidth = TRUE)

