Join Mark Niemann-Ross for an in-depth discussion in this video Showing successful cross-correlation, part of Code Clinic: R (2015).
- At first glance, cross-correlation…is an intimidating essay in statistics and math.…Let's break it down into smaller parts.…First, it's helpful to know cross-correlation…travels with its buddies auto correlation…and convolution.…And they can be expressed in formulas,…which means nothing if you…haven't studied advanced mathematics.…So let's look at what it actually does.…I'm going to leave convolution and auto-correlation…for you to study on your own.…
Cross-correlation is nothing more…than comparing two collections of data…and looking for similarities.…Put a different way, cross-correlation…is looking for the correlations…between two vectors.…That's how an R programmer would state that.…So let's take a look at some examples of cross-correlation.…I've created a sample file here called…"calculateCrossCorrelation.R"…that contains some code we can use…to play around with the concept.…The first thing this code does…is define something called "dataX"…with the contents of one through 10.…
So let's go ahead and do that.…
Mark introduces challenges and then provides an overview of his solutions in R. Challenges include topics such as statistical analysis, searching directories for images, and accessing peripheral devices.
Skill Level Intermediate
Q: R Studio tells me that it can't find files I expect to be available. Where can I find them?
A: Use the setwd() command to set the working directory to match the folder you're working in.
Q: I am unable to access the Lake Pend Oreille data from outside the U.S.
A: A static copy of this data is provided here for lynda.com members outside of the U.S.
1. Problem One: Statistical Analysis
2. Problem Two: Image Analysis
3. Problem Three: Eight Queens
4. Accessing Peripherals
5. Recursion and Directories
Walking the directory sort code10m 56s
6. Building the Web
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