I posted something similar yesterday and I feel that a sticky with the "where do VG Chartz numbers come from" that contains this information would be essential... I would add a little more detail on confidence intervals as it is prudent to point out that a smaller sample sizes generally provide a larger interval (margin of error) around the mean than larger samples do. It bears noting that to get a 100% confidence interval -- i.e. our "number" has a +- of ZERO, we are basically saying we have the EXACT number which requires a 1:1 sampling rate... Not possible in the real world and not cost effective, either... That helps illustrate why we use sampling/statistics in the first place... It also helps illustrate that NPD, Media Create, Famitsu, and others are also subject to error as the don't sample 100%, either...
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Systems I currently own: 360, PS3, Wii, DS Lite (2)
Systems I've owned: PS2, PS1, Dreamcast, Saturn, 3DO, Genesis, Gamecube, N64, SNES, NES, GBA, GB, C64, Amiga, Atari 2600 and 5200, Sega Game Gear, Vectrex, Intellivision, Pong. Yes, Pong.
