# EM-algorithm and missing data

Does EM-algorithm only work with missing data? If not, what is the idea to assume that we have missing data?

• Any density that can write as$$f_\theta(x)=\int_\mathscr{Y} g_\theta(x,y)\text{d}y$$qualifies for EM, not truly a restriction. Provided you can implement the E step. – Xi'an Sep 21 '16 at 8:31
• Check also: stats.stackexchange.com/questions/72774/… – Tim Sep 21 '16 at 8:42