Part I: Theoretical background | What SPI and SPEI measure | Temporal scales and system memory | Why distribution choice matters | Why parameter-estimation method matters | Theoretical guide to the function arguments | Data, accumulation, and calibration | Distribution and parameter estimation | Missing values, bounds, and returned objects | Part II: Practical use and package comparisons | Differences from the SPEI and SCI packages | Basic usage | SPI | SPEI | Distributions and parameter estimation | Reference periods | Supplied parameters | Custom maximum-likelihood starting values | Progress messages | Comparison design | Accuracy measures | Independent comparison tables | Graphical summaries | Interpretation | Reproducing the external-package benchmark | References

Citation | Installation | Setting up the environment | Example using NSE | Ex 1: ideal integer values | Ex 2: ideal real values | Ex 3: ideal daily ts | Ex 4: random noise in the first half of the simulated values | Ex 5: random noise and logarithmic transformation | Ex 6: random noise, logarithmic transformation and Pushpalatha2012 constant | Ex 7: random noise, logarithmic transformation and user-defined constant | Ex 8: random noise, logarithmic transformation and user-defined factor | Ex 9: random noise, user-defined transformation | A short example from hydrological modelling | Removing warm-up period | Plotting uncertainty bands | Computing P-factor | Computing R-factor | Analysis of the residuals | Software details | Version history of this vignette

Citation | Installation | Setting up the environment | Basic exploratory data analysis (EDA) | Flow duration curve (FDC) | Baseflow | Software details | Version history | Appendix | Editors, GUI | Importing data | Useful Websites | F.A.Q. | How to print more than one matrixplot in a single Figure?

Citation | Installation | Setting up the environment | Basic exploratory data analysis (EDA) | Annual analysis | Monthly analysis | Seasonal analysis | Some extreme indices | Seasonality index | Heavy precipitation days (R10mm) | Very wet days (R95p) | 5-day total precipitation | Climograph | Software details | Version history | Appendix | Editors, GUI | Importing data | Useful Websites | F.A.Q. | How to print more than one matrixplot in a single Figure?