1. An active implantable medical device for pacing, resynchronization, defibrillation, cardioversion and/or, diagnosis, comprising: means for measuring a predominantly physiologic corporeal parameter of a patient and providing a physiologic signal; means for measuring a predominantly physical corporeal parameter of the patient and providing a physical signal; means for discriminating between activity phases and rest phases of the patient, operating in response to said physiologic and physical signals, and providing a status indicator representative of the patient's status, a memory containing a plurality of fields, said plurality of fields comprising a first set of fields containing data related to the activity phases of the patient and a second set of fields containing data related to the rest phases of the patient, means for statistical processing receiving as input, said physiologic and physical signals and said status indicator, providing as output processed information, and selectively updating said plurality of fields based upon said processed information, wherein said means for statistical processing updates said first and second sets of fields using a respective inference rule of a plurality of inference rules, selectively as a function of the patient's status indicator, and means for analysis evaluating a plurality of clinical status indices based upon the data contained in the first and second sets of fields of the plurality of fields and evaluating a combined status index based the plurality of clinical status indices, wherein the each of the plurality of clinical status indices represents the patient's clinical status with one of a plurality of numerical values comprising a first signed value indicating improvement, a second signed value of the same value but opposite sign as the first signed value, the second signed value indicating degradation, and a null value indicating stability of the patient's clinical status relative to the patient's previous clinical status, and wherein the active medical device adjusts pacing parameters in response to the plurality of clinical status indices and the combined status index.