This short paper proposes a characterization for the number of traded shares or trading volume in terms of its data generating process. Share ownership plays a vital role. An empirical illustration based on the Nokia stock is included. Long memory in trading volume is linked to the long memory...

No abstract.

We argue that the practise of valuing the portfolio is important for the calculation of the Value at Risk and the Expected Shortfall. In particular, the seller (buyer) of an asset does not face a horizontal demand (supply) curve. We propose a new approach for incorporating this fact into the...

Plants' entry and exit behaviour in Swedish municipalities are studied within a fixed-effect, integer-valued autoregressive model. Based on eight industrial sectors, 1985-1993, and all municipalities, models are estimated by a generalized method of moment estimator. Influences on entry and exit...

The asymmetric moving average model (asMA) is extended to allow for asymmetric quadratic conditional heteroskedasticity (asQGARCH). The asymmetric parametrization of the conditional variance encompasses the quadratic GARCH model of Sentana (1995). We introduce a framework for testing asymmetries...

We propose a nonlinear time series model where both the conditional mean and the conditional variance are asymmetric functions of past information. The model is particularly useful for analysing financial time series where it has been noted that there is an asymmetric impact of good news and bad...

The detection of nonlinearities could depend on the sampling frequency. Asymmetric monthly series may become symmetric when aggregated to quarterly or annual frequencies. We test against nonlinearity using the nonlinear autoregressive asymmetric moving average (ARasMA) model, which nests the...

The asymmetric moving average model (asMA) is extended to allow forasymmetric quadratic conditional heteroskedasticity (asQGARCH). Theasymmetric parametrization of the conditional variance encompassesthe quadratic GARCH model of Sentana (1995). We introduce a framework fortesting asymmetries in...