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.
The PNG (portable network graphics) file format is a popular image format used in graphic design. If you have an image file in JPEG or GIF format, for example, you can use the most basic graphics editor to save that image as PNG format. To learn how, you can start by seeing part 1. 1. Launch your favorite web browser.