Z-Scores and Pearson Correlation: If we have scores that are expressed as standardized scores -- Z-Scores with a mean of zero and a variance of one -- then the formula for the Pearson Correlation becomes particularly simple.
PNG Formats. .PNG files in logo design and when you should use them. PNG is an acronym for Portable Network Graphics. PNGs are bitmpapped (raster/pixel based) image formats that can be used instead of GIF images or JPGs. PNG logo images are superior to other pixel based formats as they employ a âlosslessâ data compression system.
PNG images are also not well supported by older cell phones and feature phones. We use PNG for any file that requires transparency. We also use PNG-8 for any file that would be suitable as a GIF, using this PNG format instead. SVG Images. SVG stands for Scalable Vector Graphic. Unlike the raster-based formats found in JPG, GIF, and PNG, these files use vectors to create very small files that can be rendered at any size with no loss of quality of increase in file size.