Time geography considers that the probability of moving objects distributed in an accessible transportation network is not always uniform, and therefore density function applied to quantitative time analysis needs consider actual constraints. Existing methods construct a kernel under constraints based on principle least effort each point shortest path between anchor points has same value. This,...

We use the sinc kernel to construct an estimator for the integrated squared regression function. Asymptotic normality of the estimator at different rates is established, depending on whether the regression function vanishes or not.