Table 8 Computation of unknown structural break date.

Brent oil price-unemployment nexus model

Constant

− 29.132***

lropbtr

0.099

lrgdp

1.007***

lcpi

0.163***

lrate

− 0.020*

fdi

− 0.042

Test for a structural break: Unknown break date-Ho: no structural break

Full sample: 1979q1–2018q4

Trimmed sample: 1985q1–2013q1

Estimated break date: 1993q2

Test statistic p value

Supremum Wald test 697.143 0.0000

WTI oil price-unemployment nexus model

Constant

− 44.001***

lrwti

0.184**

lrgdp

1.504***

lcpi

− 0.004

lrate

− 0.015

fdi

− 0.080**

Test for a structural break: Unknown break date-Ho: no structural break

Full sample: 1982q1–2018q4

Trimmed sample: 1987q4–2013q2

Estimated break date: 1995q4

Test statistic p value

Supremum Wald test 685.240 0.0000