Hi @JoffJones ,
Thanks for your explanation. I am not sure if the formula is correct, but you can try changing the formula as follows.
- Add nugget values to the variance formula you saved. The formula is complex, so be careful where you add the nuggets.
![2023-09-18 183503.png 2023-09-18 183503.png](https://community.jmp.com/t5/image/serverpage/image-id/56716i0085743199051563/image-size/large?v=v2&px=999)
The original formula looks like this.
Maximum(
sigma * (1 - Vec Quadratic( [n x n], Exp( aaa ) || Exp( bbb ) || Exp( ccc )) ),
0
)
The modified formula looks like this.
Maximum(
sigma * (1 - Vec Quadratic( [n x n], Exp( aaa ) || Exp( bbb ) || Exp( ccc )) + nugget) ,
0
)
- Calculate the interval as a confidence interval
See the attached data for more details.
I checked with sample data and it seems to be a reasonable interval. I hope this helps.