The hardware and bandwidth for this mirror is donated by dogado GmbH, the Webhosting and Full Service-Cloud Provider. Check out our Wordpress Tutorial.
If you wish to report a bug, or if you are interested in having us mirror your free-software or open-source project, please feel free to contact us at mirror[@]dogado.de.

tptest 1.0.0

Initial Release

This is the first release of the tptest package, a port of the Stata tptest command for R.

Features

• tptest(): Main function for turning point and inflection point tests

  • Sasabuchi (1980) / Lind-Mehlum (2010) test for U-shape detection
  • Support for quadratic, cubic, inverse, and log-quadratic forms
  • Delta-method standard errors and confidence intervals
  • Works with lm, glm, and other standard model objects

• fieller_ci(): Fieller (1954) confidence intervals for turning points

  • More robust when denominator coefficient has high uncertainty
  • Handles bounded, unbounded, and degenerate cases

• twolines_test(): Simonsohn (2018) two-lines test

  • Alternative validation for U-shaped relationships
  • Splits data at turning point and tests slope signs

• Parametric bootstrap confidence intervals

• S3 methods: print(), summary(), plot(), coef(), confint()

Data

• ekc: Environmental Kuznets Curve example dataset
  • Simulated panel data for 50 countries over 10 years
  • Demonstrates inverse U-shaped relationship

Documentation

• Complete roxygen2 documentation with examples
• References to key papers with DOIs
• README with usage examples

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.