Chinese Commodity Price Evidence Study for COVID-19 Shock and Price Stickiness Model Design
Table 8
Structural mutation of inflation inertia.
Index
Model
(1) Inflation inertia
(2) Breakpoint
(3) t-value
All
AR(3)
−0.198
07 April 2020
−5.319
All-before
AR(4)
−0.114
—
—
All-after
AR(3)
−0.282
—
—
Food
AR(6)
−0.664
07 April 2020
−6.845
Food-before
AR(1)
−0.208
—
—
Food-after
AR(6)
−0.684
—
—
Clothing
AR(3)
−0.311
24 June 2020
−5.330
Clothing-before
—
−0.322
—
—
Clothing-after
—
−0.301
—
—
Residence
AR(2)
0.069
21 June 2020
−4.802
Residence-before
AR(2)
−0.071
—
—
Residence-after
AR(3)
−0.008
—
—
Household equipment
AR(2)
−0.106
11 April 2020
−4.969
Household equipment-before
AR(4)
0.053
—
—
Household equipment-after
AR(2)
−0.373
—
—
Transport, post, and telecommunication
AR(3)
−0.188
08 April 2020
−5.031
Transport, post, and telecommunication-before
AR(5)
−0.057
—
—
Transport, post, and telecommunication-after
AR(3)
−0.112
—
—
Culture, education, and recreation
AR(4)
0.149
19 March 2020
−2.948
Culture, education, and recreation-before
—
—
—
—
Culture, education, and recreation-after
—
—
—
—
Medicine and health care
AR(3)
−0.296
05 May 2020
−4.636
Medicine and health care-before
AR(4)
−0.225
—
—
Medicine and health care-after
AR(3)
−0.404
—
—
Other goods and services
AR(2)
−0.152
11 April 2020
−6.169
Other goods and services-before
AR(4)
−0.119
—
—
Other goods and services-after
AR(2)
−0.24
—
—
Notes: Column 1 shows inflation inertia coefficient using median unbias method to estimate the AR model. Column 2 is the date of structural mutation in AR model. Column 3 is the value that test the structural mutation.
