## How do the Re multipliers for interventions work?

The first Re multiplier is multiplied by the basic R0 to give the new Re after the first intervention. The second Re multiplier is multiplied by the basic R0 and the first Re multiplier to give the new Re after the second intervention.

Re after third intervention = R0 * intervention1.multiplier * intervention2.multiplier * intervention3.multiplier

## How many interventions can I have?

You can have any number of interventions. The template Excel input comes with 3. If you want fewer, delete one or more rows. If you want more, just add rows using the same format.

## How can I speed up LEMMA?

You can decrease iter on the Internal sheet to 500 or less. The results will be less reliable and you will probably get some warnings from Stan, but if you just want to test something out, this may work. You should increase iter back to at least 1000 for final projections.

## What should I do if I get a warning from Stan?

### There were ___ divergent transitions after warmup. Increasing adapt_delta above ___ may help. Examine the pairs() plot to diagnose sampling problems

If there are a small number of divergent transitions (less than ~10), there is usually little impact on the projections ((but this is not guaranteed). If there are a larger number, increase adapt_delta to 0.9 or 0.95 or 0.99 on the Internal sheet. Run time will be slower. We don’t recommnd using pairs(). If increasing adapt_delta does not help, there may be a problem with your parameter distributions or data (e.g. hospital census data is not compatible with cumulative hospitals).

### Maximum treedepth exceeded

Increase max_treedepth to 13 or 15 or more on the Internal sheet. Run time will be slower.

### BFMI low

Increase iter on the Interal sheet to 1500 or 2000 or more. Run time will be slower.

### R-hat

Increase iter on the Interal sheet to 1500 or 2000 or more. Run time will be slower.

### Bulk ESS

Increase iter on the Interal sheet to 1500 or 2000 or more. Run time will be slower.

### Tail ESS

Increase iter on the Interal sheet to 1500 or 2000 or more. Run time will be slower.