Model validation

[Aariq]

Model validation step for spatial GAMs:

• [x] Check number of knots is adequate
• [ ] Double-check that spline bases are appropriate for data
• [x] Double-check model assumptions
• [ ] Check with additional thresholds
• [x] Check with less down-scaled data, possibly using bam() instead of gam()

[Aariq]

Talked with @diazrenata and came up with the following ideas for getting the number of knots right:

• [ ] (re-) read ?choose.k and do the thing where you look for patterns in the residuals
• [ ] work with even more aggregated data to start with (for faster iteration)
• [ ] Follow through to ultimate analysis (map of marginal slopes with non-significant areas greyed out) because if changes in k don't produce qualitative statistical changes, they probably don't matter much
• [ ] possibly increase k more in the interaction term than in the main effects (maybe should ask someone if this is a legit thing to do though)

[Aariq]

Going to create a separate issue more specific to choosing knots