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Blake Pollard

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  • Hi all, I did some work a number of years ago training a 2-stage classification/regression model to distinguish irrigated crops in northwestern India during the Rabi (dry) season. We used logistic regression in the first stage to basically throw out…
  • I was thinking about this 10-day sampling problem and have been looking at Graham's code which computes the link-strengths and messing around with some things. What would be most useful to people here: 1) The link strength computed everyday from wh…
  • Great catch Blake!! I just wanted to note that Dara made the catch, not me!
  • I just wanted to show some animations I made when starting to look at this data again. They all show the Nino3.4 Anomalies plotted against a lagged version of itself. This one shows how the correlation between the two fall off as you increase the …
  • She doesn't use any particular software. The code that implements her method is written in C++. I got in touch with her to get the code. She calls the method 'optimal causal inference'. It is uses a recursive information bottleneck algorithm. The in…
  • So if you try to measure the distance between the amplitude peaks on x-axis you estimate the periodicity of when high amplitude frequencies re-appear in future. It is true that high-frequency peaks re-appear in time, similar to peaks in the aut…
  • I'll try to clarify some things. John's answers were spot on here. Q1:Where are these libraries used in the code? library(“Rwave”) library(“WaveletCo”) I didn't use those to create the posted images. Q2: ’lm’ is a linear regressor an…
  • Here is some R code that creates a vector and a matrix and saves them as comma-separated-value files in your working directory. It also writes a text-file with the words "Hello, world!" inside. # sets the working directory, where files will …
  • I just wanted to comment that the method of downloading a bunch of raw data via 'ftp' (file transfer protocol) is a great one to become familiar with. If you poke around on ftp://ftp.cdc.noaa.gov/Datasets or some other ftp servers maintained by g…
  • I used to work at the Water Center, which is part of the Earth Institute. The Earth Institute has such a wide gamut of research interests its hard to say who to contact there who might be interested in Azimuth. They focus on the society/people side …