Shujie Ma, Jeffrey S. Racine, and Lijian Yang, "Spline Regression in
the Presence of Categorical Predictors", Journal of Applied
Econometrics, Vol. 30, No. 5, 2015, pp. 705-717.

The accompanying R code, which is zipped in the file mry-code.zip, 
requires installation of the R packages `np' and `crs' which may be
obtained in the usual manner from CRAN after having installed R. For 
example, type "install.packages("np")" within R.

The dataset is part of the 'np' package. Type ?oecdpanel within R for 
details.  The dataset is also zipped in the file mry-data.zip.

Since the code file ma-racine-yang.R and the data file oecdpanel.dat are 
ASCII files in DOS format, Unix/Linux users should use "unzip -a".

*****

oecdpanel                  package:np                  R Documentation

Cross Country Growth Panel

Description:

     Cross country GDP growth panel covering the period 1960-1995 used
     by Liu and Stengos (2000) and Maasoumi, Racine, and Stengos
     (2007). There are 616 observations in total. 'data("oecdpanel")'
     makes available the dataset "oecdpanel" plus an additional
     object "bw".

Usage:

     data("oecdpanel")

Format:

     A data frame with 7 columns, and 616 rows.  This panel covers 7
     5-year periods: 1960-1964, 1965-1969, 1970-1974, 1975-1979,
     1980-1984, 1985-1989 and 1990-1994.

     A separate local-linear 'rbandwidth' object ('bw') has been
     computed for the user's convenience which can be used to visualize
     this dataset using 'plot(bw)'.

     growth the first column, of type 'numeric': growth rate of real
          GDP per capita for each 5-year period

     oecd the second column, of type 'factor': equal to 1 for OECD
          members, 0 otherwise

     year the third column, of type 'integer'

     initgdp the fourth column, of type 'numeric': per capita real GDP
          at the beginning of each 5-year period

     popgro the fifth column, of type 'numeric': average annual
          population growth rate for each 5-year period

     inv the sixth column, of type 'numeric': average investment/GDP
          ratio for each 5-year period

     humancap the seventh column, of type 'numeric': average secondary
          school enrolment rate for each 5-year period

Source:

     Thanasis Stengos

References:

     Liu, Z. and T. Stengos (1999), "Non-linearities in cross country
     growth regressions: a semiparametric approach," Journal of Applied
     Econometrics, 14, 527-538.

     Maasoumi, E. and J.S. Racine and T. Stengos (2007), "Growth and
     convergence: a profile of distribution dynamics and mobility,"
     Journal of Econometrics, 136, 483-508