R Under development (unstable) (2026-03-16 r89642 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(xtpcmg)
> 
> test_check("xtpcmg")
-----------------------------------------------------------------
Panel Cointegrating Polynomial Regression: Group-Mean FM-OLS (Wagner & Reichold 2023)
Dep: invest | Poly: mvalue (degree 2) | N=5, T=20
-----------------------------------------------------------------
Variable           Estimate   Std. Err     t-stat    p-value
-----------------------------------------------------------------
mvalue               0.7154     0.5885     1.2156     0.2241
mvalue^2             0.0017     0.0008     2.0782     0.0377**
-----------------------------------------------------------------
Turning point x*: -214.1322 [95% CI: -736.5063, 308.2418] (U-shaped)
Swamy S = 8.0000, df = 8, p = 0.4335 [Homogeneous]
*** p<0.01, ** p<0.05, * p<0.10
-----------------------------------------------------------------
Panel Cointegrating Polynomial Regression: Group-Mean FM-OLS (Wagner & Reichold 2023)
Dep: invest | Poly: mvalue (degree 2) | N=5, T=20
-----------------------------------------------------------------
Variable           Estimate   Std. Err     t-stat    p-value
-----------------------------------------------------------------
mvalue               0.7154     0.5885     1.2156     0.2241
mvalue^2             0.0017     0.0008     2.0782     0.0377**
-----------------------------------------------------------------
Turning point x*: -214.1322 [95% CI: -736.5063, 308.2418] (U-shaped)
Swamy S = 8.0000, df = 8, p = 0.4335 [Homogeneous]
*** p<0.01, ** p<0.05, * p<0.10

Individual FM-OLS Estimates (first 5 panels):
  Panel 1: 4.3875  -0.0009
  Panel 2: -0.7292  0.0027
  Panel 3: 1.7583  -0.0005
  Panel 4: -1.1102  0.0044
  Panel 5: -0.7292  0.0027
[ FAIL 0 | WARN 0 | SKIP 0 | PASS 28 ]
> 
> proc.time()
   user  system elapsed 
   1.03    0.34    1.35