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| DateConversion | Conversion between Different Date Format |
| stkde | Spatio-Temporal Kernel Density Estimation with Density Contours |
| stkde.base | Spatio-Temporal Kernel Density Estimation |
| stkde.sig | Spatio-Temporal Kernel Density Estimation with Significant P-Value contours |
| UorL | Converting all the Letters of Character Variable into Uppercase or Lowercase |