Phillips (1986) provides asymptotic theory for regressions that relate nonstationary time series including those integrated of order 1, I(1). A practical implication of the literature on spurious regression is that one cannot trust the usual confidence intervals. In the absence of prior...

This paper considers estimation situations where identification, endogeneity and non-spherical regression error problems are present. Instead of always using GMM despite weak instruments to solve the endogeneity, it is possible to first check whether endogeneity is serious enough to cause...

Consumer theory still maximizes utility subject to a budget constraint, when in fact 2008 data show that consumer debt is 130% of disposable income. Granger-causality tests confirm Consumption precedence over income. We discuss several features of newer US data, such as the ability to start...

A new two-way map between time domain and numerical magnitudes or values domain (v-dom) provides a new solution to heteroscedasticity. Since sorted logs of squared fitted residuals are monotonic in the v-dom, we obtain a parsimonious fit there. Two theorems prove consistency, asymptotic...

While moving block bootstrap (MBB) has been used for mildly dependent (m-dependent) time series, maximum entropy (ME) bootstrap (meboot) is perhaps the only tool for inference involving perfectly dependent, nonstationary time series, possibly subject to jumps, regime changes and gaps. This brief...

This paper attempts to compare the performance of presidents George W. Bush and Obama in the context of reduction of unemployment by comparing the Beveridge curve tradeoffs between vacancy and unemployment rates. We consider monthly data and measure the output of the economy as gross value of...