I have the following code for my error model. 
How can i set the model so that my packet loss rate is 20%.

Thanks for your help



set good [new ErrorModel/Uniform 0 pkt]
set bad [new ErrorModel/Uniform .7 pkt]

set m_states [list $good $bad]
set m_periods [list 0.1 0.75]
set m_transmx {{0.9 0.1} {0.7 0.3}}
set m_trunit pkt
set m_sttype time
set m_nstates 2
set m_nstart [lindex $m_states 0]

set errmod [new ErrorModel/Multistate $m_states $m_periods $m_transmx \
$m_trunit $m_sttype $m_nstates $m_nstart]

$ns link-lossmodel $errmod $n0 $n1






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