The notebooks contained with the textbook were developed under MATLAB version 5.3. Some time ago version 6 was released. Several functions implementing autoregressive modeling had their structure changed such that script written for version 5.3 is not forward compatible. This effected two notebooks. The upgraded versions, armod_v6.doc and psdest_v6.doc are downloadable from the links shown. Also an additional notebook regarding stationarity, stationarity.doc, is available.