| Accuracy | Verify how well NASA-POWER Data Represent Observed Data |
| DistPar | Parameters for Calculating the SDIs Provided by the ScientSDI Function |
| ObsEst | Example Data of the Input Required by the Accuracy Function |
| OperatSDI | Calculate Routine NASA-SPI and NASA-SPEI Estimates |
| plot.PowerSDI.Accuracy | Plots PowerSDI.Accuracy Objects |
| PlotData | Plot Rainfall and Potential Evapotranspiration Data |
| print.PowerSDI.Accuracy | Prints PowerSDI.Accuracy Objects |
| Reference | Calculate the SPI and SPEI Using a Reference Data Source |
| refHS | Example of the Input Required by the Reference Function |
| refPM | Example of the Input Required by the Reference Function |
| ScientSDI | Estimate parameters of Gamma, Generalized Extreme Value, or Generalized Logistic Distributions |