emissions per p-km and t-km than other modes of travel. Table 4 shows various relevant emissions estimates from the literature for rail and road. From these figures it can reasonably be inferred that direct
; Madueno et al., 2016; Nicolosi et al., 2014). A latent variable is not directly observed but rather inferred from other proxies that can be measured. Given several sub-varieties of latent variable analysis
the US administration and the Federal Reserve. Despite gloomy predictions prompted by the economic downturn, domestic political uncertainties and suspension of investment projects in Map Ta Phut