Time Travel discussion
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The bar chart that shows how many 5, 4, 3, 2, and 1-star reviews showed two bars, one at the 5-star and one at the 2-star levels. According to the chart the two-star review was counted as 43% of my reviews (???) and all the rest were 57%. I figure one out of four to be 25%, but that's not what Amazon shows on the page for my book and the impact of that bad review is disproportionately high. Mysteriously high, I might say.
If that bar chart is a mirror of customer ratings, it seems that yesterday's reviewer does not cast a reflection. In another genre, a character in that category would be called 'vampire.' It feels a little like that to me, now. Has anybody else experienced this?

The rest of your question is algorithm-based. Older reviews "degrade" in influence over time, while recent reviews exert more influence. So, the new review is weighted much heavier than those reviews from years ago.
For me, my introduction in books was reading Wells' The Time machine after seeing the old movie version.