iOS App Store
在iTunes App Store，在搜索结果中排名越靠前的应用，一般也都是评级更高的产品。我们随机选择了“简单”、“中等”和“竞争激烈”三个级别的搜索字段进行调查。在这里，“简单”搜索字段意味着其搜索结果在1-25个之间，“中等”字段则有26-100个搜索结果，“竞争激烈”字段则有101个以上搜索结果。然后我们计算了排名第1至第10名的应用评级情况，发现从第8名开始，应用评级情况就开始急剧下滑。
我们原先认为在这三种字段的搜索结果中，排名前10的应用均是拥有最高评级，并且与关键字最为匹配的应用。但数据表明，如果是在“简单”字段搜索过程中，排名第10的应用所得评级也可能低至1.09分。这种低分与其较高的搜索排名位置并不相称。而从“竞争激烈”字段搜索结果来看，第10名应用评级也可能低至2分左右（游戏邦注：其原始数据取自苹果推出Chomp Update这项影响iTunes App Store应用排名的举措之前）。
我们也针对Google Play进行了同样的分析，发现无论是在“简单”、“中等”还是“竞争激烈”字段搜索结果中，排名前10的应用都有较高评级，并没有出现像iTunes App Store那种非正常的应用评级下滑情况。我们认为这反映了Google Play在搜索排名上比iTunes App Store更重视应用评级情况。
由此我们可得结论，高评级/高质量应用一般也更有可能显示在Google Play搜索结果前列位置。Google Play搜索算法更有利于提升高质量应用的曝光度。
那些同时高居搜索结果和热门榜单排名前列的应用一般都有较高的评级得分，这种趋势在Google Play的表现比iTunes App Store更为明显。（本文为游戏邦/gamerboom.com编译，拒绝任何不保留版权的转载，如需转载请联系：游戏邦）
How rating affects ranking in search results and top charts across platforms
Ian Sefferman is co-founder and CEO of MobileDevHQ, a company that provides app store optimization and marketing tools. His guest post contains data pulled from the company’s backend and an analysis of how a mobile app’s rating in the App Store and Google Play top charts can be correlated to an app’s rank in search. You can follow him on Twitter, @iseff, or read his blog.
It’s clear that app stores take app ratings into account when ranking an app in search results and top charts. Not only does this help propel deserving apps to the top, but it also helps you sort through all the crap that unfortunately and inevitably clogs app stores.
But, beyond knowing that rating does affect search position and chart rankings, how does rating affect search position?
Intuitively, you would expect that the higher an app is rated, the higher it will rank. That’s essentially what our data showed, with one important twist.
In iTunes App Store, the higher positions generally had higher rated apps. We took a random sample of “easy” search terms, “medium” search terms and “competitive” search terms. For the purposes of this post, easy is defined as having 1 to 25 results, medium as having 26 to 100 results and competitive as having more than 101 results. We then averaged the ratings of apps from positions 1 through 10. The twist is that, on average, rating drops significantly after position 8.
Our rational thought process for understanding the top 10 results for any search term is that the first 10 apps will be the highest rated, as well as the most relevant for that keyword. But, as the data shows, the ratings can reach as low as 1.09 for an app ranked tenth for an “easy” search term. That’s a pretty terrible rating paired with a respectable search ranking. Although visibility for an app ranked tenth for easy search term is not nearly as impressive as that for a No. 10-ranked app for competitive keywords, the rating for an app ranked No. 10 for competitive keywords is still, on average, down to a little over 2.
The initial data we pulled for this analysis was taken prior to Apple’s Chomp Update, which is significantly changing how iTunes App Store is ranking apps. That said, our initial analysis shows that average rating has not played a major part in this change. We’ll keep watching for updates.
Even more surprisingly, iOS top charts behave very similarly, if not a little worse. What this means is that the apps in the top charts did not necessarily reach that pinnacle of visibility through ratings alone. We know that download velocity has a lot to do with top charts, but it would seem intuitive that inclusion in Top Charts would, among other things, mean high ratings. The data, however, does not back this up.
Drawing from this, it means rating isn’t everything. It means something — but it certainly seems to mean a lot less than other factors such as download velocity.
We performed the same analysis for Google Play. What we found is that the top 10 search results returned for any difficulty were rated highly; there was no drop like the one seen in the iTunes App Store. We believe this means Google Play weights rating more heavily in search rankings than iTunes App Store does.
From that, we can draw the conclusion that high rating/high quality equals a higher chance of breaking into Google Play’s higher-ranked search echelons. Google Play’s search algorithm seems to take a more meritocratic approach to app discovery and visibility, letting higher quality apps rise to the top.
Yet again, Google Play’s Top Charts calculations appear to value high ratings heavily in top charts. While a high rating may not be sufficient to be in the top charts, it would appear to be necessary.
Those apps fortunate enough to find themselves within the top strata of either search results or top charts are generally rated highly. This trend, however, appears to be more true on Google Play than on the iTunes App Store.（source:insidemobileapps）