Timeline for Standardized Precipitation Index (SPI) equation using ArcGIS Desktop
Current License: CC BY-SA 4.0
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 5, 2019 at 12:28 | comment | added | Vince | @user97103 You should probably have mentioned this in the question, no? | |
| Dec 5, 2019 at 11:10 | comment | added | user97103 | Yes thank you, I answered that question. At that time, I found that was the simple approach to calculate the SPI using the long-term average and stdev. Then recently I found that method is not perfectly correct, we need to calculate the gamma distribution. So thats why I ask above question in here. | |
| Dec 5, 2019 at 11:04 | history | answered | PolyGeo♦ | CC BY-SA 4.0 |