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.
Answer: PNG files are Raster Image Files primarily associated with Fireworks Image File (Macromedia). PNG files are also associated with Portable (Public) Network Graphic, Paint Shop Pro Browser Catalog (Corel Corporation), Spore Creature File (Electronic Arts Inc.) and FileViewPro. Additional types of files may also be using the PNG file extension.