Rafter Sass Ferguson

4 Questions 7 Answers 0 Followers

Questions related from Rafter Sass Ferguson

Tuning sigma for a kernel PCA - using sum of eigenvalues of first n components?

I'm working with a large dataset (P = 13, N = ~4500) with lot's of nonlinearity. I'm interested in reducing dimensions prior to clustering. Kernel PCA seems like a good approach. I'm wondering...

04 November 2017 3,389 5 View

What is the best month for comparing Normalized Difference Vegetation Index values, for across sites spread out across the US?

I'm modeling labor productivity on farm sites spread widely across the US, and I would like to include NDVI (or another vegetation index) as a predictor variable. I'm wondering if there is month...

06 July 2016 7,332 5 View

What are the institutional hot spots for agroecology & food sovereignty research?

I'm interested to hear what people think are the most dynamic & exciting labs and research groups focusing on agroecology and food sovereignty research. I have my own modest list, but I'm...

07 March 2016 7,475 17 View

How can I calculate R2 for an Bayesian MCMC multilevel model?

How can I calculate conditional and marginal r-squared (cf. Nakagawa et al 2013, http://onlinelibrary.wiley.com/doi/10.1111/j.2041-210x.2012.00261.x/abstract) for a Bayesian multilevel,...

15 July 2015 7,287 6 View