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.
So whatâs the difference? In brief: A logo is a word, a symbol is a picture, and a combination mark is a PB&J mashing up the two. But really, in most circumstances, using âlogoâ for everything is just fine, say Pentagramâs Michael Bierut and Ammunition Groupâs Brett Wickens. Just donât expect the pedants to like it.