Good day all.

I am trying to learn the StrucBreak package. can some one please point me to how to interpret the results below. I tried to follow the sample script in the package using the PDF guide to the StrucBreak package.

gretl version 2018c
Current session: 2018-10-14 09:33

? include StrucBreak.gfn
StrucBreak 0.21, 2018-01-09 (Riccardo "Jack" Lucchetti and Sven Schreiber)
? open wp.gdt

Read datafile C:\Users\HP\Documents\gretl\wp.gdt
periodicity: 1, maxobs: 44
observations range: 1971 to 2014

Listing 6 variables:
  0) const      1) Nigeria    2) Ghana      3) Togo       4) Senegal 
  5) Benin   

? list Z = const Nigeria(-1)
? list X = null
? bundle bII = SB_Setup(Nigeria,Z,X,3)
SB_Setup: OK!
? bII.nh = 8 # dustance between breaks
? strings opts = defarray("HetdatYes", "HetvarYes", "HetomegaNo", "HetqNo")
? SB_SetOptions(&bII, opts)
? SB_Global(&bII)

===================================================================
   Options are now:
===================================================================
Robust S.E.:    OFF
Warning: inappropriate if lagged dependent variables
         are included as regressors
Hetdat:  ON
Hetvar:  ON, Hetomega: OFF, Hetq: OFF
beta     :     Nonfixed
Eps = 0.000    Eps1 = 0.100    Max. breaks = 3

Min. distance between breaks = 8


===================================================================
   OUTPUT FROM THE GLOBAL OPTIMIZATION STAGE
===================================================================
Breaks           SSR    Dates

     1    4117.47615    30 (2001)
     2    3394.26266    10 (1981), 30 (2001)
     3    3108.58184    10 (1981), 22 (1993), 30 (2001)

===================================================================
   OUTPUT FROM THE APPLICATION OF INFORMATION CRITERIA
===================================================================
tmp (4 x 3)

      Breaks          BIC          lwz
      0.0000       4.8725       4.9201
      1.0000       4.8242       5.0223
      2.0000       4.8935       5.2483
      3.0000       5.0679       5.5869

The number of breaks chosen by BIC is : 1
The number of breaks chosen by LWZ is : 0
? SB_Tests(&bII)

===================================================================
   OUTPUT FROM THE TESTING PROCEDURES
===================================================================
a) supF tests against a fixed number of breaks
--------------------------------------------------------
    supF(1|0)   supF(2|0)   supF(3|0)
      11.432      11.189      10.897

Critical values:
           supF(1|0)   supF(2|0)   supF(3|0)
10%           10.37        9.43        8.48
5%           12.25       10.58        9.29
2.5%           13.86       11.63       10.14
1%           16.19       12.90       11.12
--------------------------------------------------------
b) Dmax tests against an unknown number of breaks
--------------------------------------------------------
UDmax test: 11.431741
Crit. values:    10%: 10.86 5%: 12.59 2.5%: 14.15 1%: 16.19

........................................................
    WDmax test    (crit. val.)
10%       13.33       11.71
5%       14.37       13.66
2.5%       14.90       15.33
1%       15.87       17.80
********************************************************
supF(l+1|l) tests using global optimizers under the null
--------------------------------------------------------
supF(2|1)     10.93    1981
supF(3|2)     10.70    1993
--------------------------------------------------------
Critical values:   10%    5%  2.5%    1%
       supF(2|1)  12.19 13.83 15.51 17.58
       supF(3|2)  13.20 14.73 16.55 18.31

# eval bII.BreakDates
? SB_Estimate(&bII,"FIX",2)

===================================================================
   OUTPUT FROM ESTIMATION OF THE MODEL WITH 2 BREAKS (fixed)
===================================================================
? SB_PrintEstimates(&bII)

Dependent variable: Nigeria
----------------------------------------------------------------
Subsample 1: 1972 - 1981

              coefficient   std. error     z     p-value
  -------------------------------------------------------
  const        15.0822       7.86913     1.917   0.0553   *
  Nigeria_1     0.729122     0.159461    4.572   4.82e-06 ***

Subsample 2: 1982 - 2001

              coefficient   std. error     z     p-value
  -------------------------------------------------------
  const        53.0242      12.7994      4.143   3.43e-05 ***
  Nigeria_1     0.379843     0.151844    2.502   0.0124   **

Subsample 3: 2002 - 2014

              coefficient   std. error     z     p-value
  ------------------------------------------------------
  const        61.0134      18.9376      3.222   0.0013  ***
  Nigeria_1     0.552676     0.149888    3.687   0.0002  ***

--------------------------------------------------------------
Confidence intervals for the break dates
--------------------------------------------------------------
The 95% C.I. for the 1th break is: 1976 - 1986
The 90% C.I. for the 1th break is: 1977 - 1985
The 95% C.I. for the 2th break is: 1999 - 2003
The 90% C.I. for the 2th break is: 1999 - 2003
********************************************************

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