A REEXAMINATION OF THE CELL-LINEAGE DATA OF POWELL,E.O

E. O. Powell carried out numerous experiments observing cell-generatio n times on bacteria. His statistical methodology, though quite advance d 40 years ago, can be enhanced by better models of dependence, by adv anced computational methods, and by judicious use of robust methods. W e reexamine Powell's data, focussing on his main interest in establish ing whether there were indeed dependencies in generation times between cells with close filial connections.