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LaTeX errors found:
! Undefined control sequence.
<argument> I_i = I(T_{i} \leqslant 
                                   C_{i})
l.121 ...nd \eqn{I_i = I(T_{i} \leqslant C_{i})}{}
                                                   is the censoring indicator.
! Undefined control sequence.
<argument>  \bf {y} \overset 
                             {\rm {d}}= Z_{0}\bf {x}= \left \{ \begin {array...
l.193 ... \ 1-\lambda_0 \\ \end{array} \right. }{}
                                                  
! Undefined control sequence.
<argument> ... \begin {array}{ll} \bf {0} & \text 
                                                  {with probability} \ \lamb...
l.193 ... \ 1-\lambda_0 \\ \end{array} \right. }{}
                                                  
! Undefined control sequence.
<argument> ...ty} \ \lambda _0 \\ \bf {x} & \text 
                                                  {with probability} \ 1-\la...
l.193 ... \ 1-\lambda_0 \\ \end{array} \right. }{}
                                                  
! Undefined control sequence.
<argument> ...cdots , \lambda _m)^{T} \in \mathbb 
                                                  {R}_{+}^{m} 
l.195 ...\lambda_m)^{T} \in \mathbb{R}_{+}^{m} }{}
                                                  , \eqn{\bf{\theta}=(\theta...
! Undefined control sequence.
<argument> I_{ij} = I(T_{ij} \leqslant 
                                       C_{ij})
l.260 ...qn{I_{ij} = I(T_{ij} \leqslant C_{ij})}{}
                                                   is the censoring indicator.
! Undefined control sequence.
<argument> ...=1}^{m} p_{j} = 1 , p_{j} \geqslant 
                                                  0
l.390 ...j=1}^{m} p_{j} = 1 , p_{j} \geqslant 0}{}
                                                  .
! Undefined control sequence.
<argument> ...)^{2}}{2 \sigma ^{2}} )} \centerdot 
                                                  I(y \geq a) 
l.535 ...\sigma^{2}} )} \centerdot I(y \geq a) }{}
                                                  
! Undefined control sequence.
<argument>  \Phi (\centerdot 
                             ) 
l.537 ...ma}) }{}, and  \eqn{ \Phi(\centerdot) }{}
                                                   is the cdf of the standar...
! Undefined control sequence.
<argument>  {y} \overset 
                         {\rm {d}}= Z{x}= \left \{ \begin {array}{ll} {0} & ...
l.1152 ...} \ 1-\lambda \\ \end{array} \right. }{}
                                                  
! Undefined control sequence.
<argument> ...t \{ \begin {array}{ll} {0} & \text 
                                                  {with probability} \ \lamb...
l.1152 ...} \ 1-\lambda \\ \end{array} \right. }{}
                                                  
! Undefined control sequence.
<argument> ...obability} \ \lambda \\ {x} & \text 
                                                  {with probability} \ 1-\la...
l.1152 ...} \ 1-\lambda \\ \end{array} \right. }{}
                                                  
! Undefined control sequence.
<argument> ...ambda _i/q_i) < \theta _i \leqslant 
                                                  1
l.1155 ...\lambda_i/q_i) < \theta_i \leqslant 1}{}
                                                   and \eqn{q_i \geqslant 4}...
! Undefined control sequence.
<argument> q_i \geqslant 
                         4
l.1155 ...eqslant 1}{} and \eqn{q_i \geqslant 4}{}
                                                   is the largest positive i...