equency of the words at each HSK level. Log frequency is used because word frequency data is very right skewed; a few words are used a lot, and the vast majority are used at very low frequency. The vertical scale shows how many words of that frequency exist at each HSK Level.</div>  <div><div style="height: 20px; overflow: hidden;"></div> <div id="541720620884008527-gallery" class="imageGallery" style="line-height: 0px; padding: 0; margin: 0"> <div id="541720620884008527-imageContainer0" style="float:left;w