svyttest               package:survey               R Documentation

_D_e_s_i_g_n-_b_a_s_e_d _t-_t_e_s_t

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

     One-sample or two-sample t-test.  This function is a wrapper for
     'svymean' in the one-sample case and for 'svyglm' in the
     two-sample case. Degrees of freedom are 'degf(design)' for the
     one-sample test and 'degf(design)-1' for the two-sample case.

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

     svyttest(formula, design,  ...)

_A_r_g_u_m_e_n_t_s:

 formula: Formula, 'outcome~group' for two-sample, 'outcome~0' or
          'outcome~1' for one-sample 

  design: survey design object

     ...: for methods 

_V_a_l_u_e:

     Object of class 'htest'

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

     't.test'

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

     data(api)
     dclus2<-svydesign(id=~dnum+snum, fpc=~fpc1+fpc2, data=apiclus2)
     svyttest(enroll~comp.imp, dclus2)

     svyttest(I(api00-api99)~0, dclus2)

