search for: contengency

Hi List, Say I have a data.frame "DF" with 6 columns, 3 factors and 3 variables, with different number of repetitions for each combination of factors. I would like to build, for two given factors, a matrix per variable, containing in each cell the mean or sd for a given couple of factors. I have managed to get to the result I wanted step by step, but I would like to have it in a

I've made a few OS's from the the CentOS 6 base images in AWS, and they're working quite wwell. But I'm reaalizing that they do not have the enhanced networking enabled by default. And I'm also realizing that I have to *stop* the OS in AWS terms, enable network enhanced networking manually, and lose all the contengs of my ephemereal storage when I do this. Is there any reason