====== Mediation analysis with missing data through EM ======
===== References =====
  * {{:lab:papers:4061ch05.pdf|Book chapter by Schafer on the implementation of EM algorithm}}
  * {{:lab:papers:mcardle_1984.pdf|RAM model}}
  * {{:lab:projects:10bmem:a_general_mediation_model_using_ram_notation.pdf|A general mediation model using RAM notation.PDF}}

===== What has been done =====
Software for the simple mediation model in the figure below has been developed. The software allows the use any number of auxiliary variables. It first estimates the covariance matrix of all input variables and then conducts parameter estimates for the mediation model.
  * [[http://bmem.psychstat.org/files/bmem.pdf|Manual]]
  * [[http://www.psychstat.org/viewvc/viewvc.cgi/?root=bmem|Source codes]] (username: lab ; password: 6312902)
 

{{:lab:projects:10bmem:zhangwang.jpg}}

===== Extensions =====
  * Extend it to a general mediation model using path analysis
  * Parallel computation
  * Extend to categorical variables
  * Extend to include latent variables