Eleven years of arrival time data for PSR 0833–45 collected at Goldstone, CA were analysed by fitting a simple model of the pulse period to the data in a least-squares sense. Four large jumps δP in period P of δP/P ~ −2 × 10−6 have occurred in which P increases up to 2% of its pre-jump value. Then P decays nearly exponentially with a time scale of 40 to 80 days to (1.2471 ±5) x 10−13 ss−1, regardless of the size of the jump. Q values for the jumps are about 6.5%. Further decay of P is at the constant rate (within an interjump era) of −5 × 10−24 < P < −9 × 10−24 ss−2. The observable effects of random fluctuations in P or P are an order of magnitude smaller than the systematic effects evident in P.