EditorUniversitat Politècnica de Barcelona. Centre de Càlcul
Condiciones de accesoAcceso abierto
This paper was presented at the opening session of the First Catalan International Symposium on Statistics, held in Barcelona, September 1983, in honour to the late Gwilym M. Jenkins. It is therefore a special paper in its format. It is a great honour for our Journal to publish it (Editor's note).