R Under development (unstable) (2026-03-12 r89611 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(fourierur)
> 
> test_check("fourierur")
======================================================================
  Running all Fourier Unit Root Tests
======================================================================

1. FOURIER LM TEST (Enders & Lee, 2012a)
--------------------------------------------------
----------------------------------------------------------------------
  Fourier LM
  Enders & Lee (2012a)
----------------------------------------------------------------------
  Observations (T) : 80
  Optimal frequency k : 3 
  Optimal lag p        : 2 
  LM statistic         : -1.621 
  Critical values:
    1%  : -3.980 
    5%  : -3.310 
    10% : -2.960 
  Significance         :     (not significant) 
  Conclusion: Cannot reject unit root null
----------------------------------------------------------------------

2. FOURIER ADF TEST (Enders & Lee, 2012b)
--------------------------------------------------
----------------------------------------------------------------------
  Fourier ADF
  Enders & Lee (2012b)
----------------------------------------------------------------------
  Observations (T) : 80
  Model             : Constant + Trend (Model 2)
  Optimal frequency k : 2 
  Optimal lag p        : 1 
  ADF statistic        : -3.838 
  Critical values:
    1%  : -4.690 
    5%  : -4.050 
    10% : -3.710 
  Significance         : *   (10%) 
  Conclusion: Cannot reject unit root null
----------------------------------------------------------------------

3. FOURIER GLS TEST (Rodrigues & Taylor, 2012)
--------------------------------------------------
----------------------------------------------------------------------
  Fourier GLS
  Rodrigues & Taylor (2012)
----------------------------------------------------------------------
  Observations (T) : 80
  Model             : Constant + Trend (Model 2)
  Optimal frequency k : 3 
  c-bar               : -14.7500 
  Optimal lag p        : 2 
  GLS-ADF statistic    : -1.743 
  Critical values:
    1%  : -4.044 
    5%  : -3.367 
    10% : -3.037 
  Significance         :     (not significant) 
  Conclusion: Cannot reject unit root null
----------------------------------------------------------------------

4. FOURIER KPSS TEST (Becker, Enders & Lee, 2006)
--------------------------------------------------
----------------------------------------------------------------------
  Fourier KPSS
  Becker, Enders & Lee (2006)
----------------------------------------------------------------------
  Observations (T) : 80
  Model             : Constant + Trend (Model 2)
  Optimal frequency k : 2 
  KPSS statistic       : 0.3629 
  Critical values:
    1%  : 0.202 
    5%  : 0.132 
    10% : 0.103 
  Significance         : *** (1%) 
  Conclusion: Reject stationarity null at 5%
----------------------------------------------------------------------

5. FFFFF-DF TEST (Omay, 2015)
--------------------------------------------------
----------------------------------------------------------------------
  FFFFF-DF
  Omay (2015)
----------------------------------------------------------------------
  Observations (T) : 80
  Model             : Constant + Trend (Model 2)
  Fractional freq k_fr : 1.8000 
  Optimal lag p        : 1 
  F-stat (Fourier)     : 6.642  CV(5%) = 3.120 
  F decision: Fourier terms significant
  FFFFF-ADF statistic  : -4.037 
  Critical values:
    1%  : -4.770 
    5%  : -4.140 
    10% : -3.810 
  Significance         : *   (10%) 
  Conclusion: Cannot reject unit root null
----------------------------------------------------------------------

6. DOUBLE FREQUENCY FOURIER DF TEST (Cai & Omay, 2021)
--------------------------------------------------
----------------------------------------------------------------------
  Double Frequency Fourier DF
  Cai & Omay (2021)
----------------------------------------------------------------------
  Observations (T) : 80
  Model             : Constant + Trend (Model 2)
  Optimal (k_s, k_c)   : ( 2 , 3 )
  Optimal lag p        : 7 
  F_Dfr statistic      : 8.382 
  F CV: 90%= 9.785   95%= 11.450   99%= 15.195 
  F decision: Cannot reject linearity (standard DF may be preferred)

  tau_Dfr statistic    : -0.451 
  Asymptotic critical values:
    1%  : -5.056 
    5%  : -4.207 
    10% : -3.770 
  Significance (asymptotic):     (not significant) 
  Conclusion: Cannot reject unit root null
----------------------------------------------------------------------

======================================================================
  All Fourier unit root tests completed.
======================================================================
  Computing sieve bootstrap critical values (B=50) ...
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 45 ]
> 
> proc.time()
   user  system elapsed 
   0.85    0.20    1.04