title: Convenient numerical procedures for estimating cumulative pregnancy curves.
abstract: OBJECTIVE
  To develop a simple estimation procedure that will always converge on a solution for a two-parameter model of cumulative pregnancy curves.
  
  
  METHODS
  Utilize raw data from a previous study in which estimation of the two-parameter model did not converge on a solution, and re-estimate the model with the new estimation method. PATIENTS, SETTING, TREATMENT: Infertile women with endometriosis treated as outpatients with laser laparoscopy.
  
  
  METHODS
  Pregnancy and ability of the new computer program to converge on a solution.
  
  
  RESULTS
  The new estimation procedure converged on a solution. Over all stages of endometriosis, the cure rate from laser laparoscopy was 56%, and the monthly probability of pregnancy among those cured was 9.7%.
  
  
  CONCLUSIONS
  The new estimation procedure, written for a personal computer, is easy to use and will virtually always converge on a solution for the two-parameter model of cumulative pregnancy after infertility treatment.
authors.affiliation: Department of Obstetrics and Gynecology, University of Pittsburgh School of Medicine, Pennsylvania.
authors.forename: D S
authors.initials: DS
authors.lastname: Guzick
authors.forename: D
authors.initials: D
authors.lastname: Bross
mesh_terms: D004715:Endometriosis / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D007247:Infertility, Female / Q000209:etiology* / Q000601:surgery; D053685:Laser Therapy; D015233:Models, Statistical; D011247:Pregnancy; D011336:Probability; D012984:Software