what is statistical significance when using nopi? if the oil price is a nonsignificant factor, why would we add lags which statistical significance to rely on in this study? how to find structural break point in oil price what is the pstar of no pi how to test for lag in a regression which statistical significance to rely on how to test for a structural break in the relationship what statistical significance is needed to estimate gdp? how to find gdp lags in ic which statistical significance to rely on what statistic should i test for in the regression is lag a statistical value how to find structural breakpoint in model what is gdp and oil prices when to test gdp for any lag which statistically significant variable should i check if a gdp is a stable factor what is the lag function for an oil rate estimator which statistic do i use when estimating gdp if gdp is linear or dynamic