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Apple最近在iTunesConnect里最新发布了官方统计工具，提供了现有友盟统计平台和自有统计平台无法统计的数据，具有自己的独有特点，尤其是下面几个最让人头疼的流量分析转化，可以在App Analytics里得以解决，例如：
由于苹果自己的统计方式和其他平台有所区别，且文档只提供了英文版，故整理了常见的Q&A并翻译，其中问题的翻译，会保持和Apple自己的中文翻译一致，方便大家对照查看，在回答的翻译，有的方便理解，会改用咱们自己常说的术语。（PS：稍稍鄙视下Apple生造名词的做法）
Q：为什么会出现AppStore查看次数的访问次数低于App购买量（例如某个营销活动或往网站来源）
A：This can happen if the customer downloads your app without visiting your app‘s page in the App Store. For example, if a customer searches for your app in the App Store and downloads it directly from the search results, this will generate an App Unit but not an App Store View.
Q：如何界定一个下载是否是归因于一个营销活动（推广链接）？
A：The attribution window for campaigns is 24 hours. This means you‘ll get credit for sales that occur up to 24 hours after that customer uses your link. If a customer uses more than one campaign link during a certain period, only the most recent campaign link is credited for sales that happen after it‘s used.
A：Sessions counts the number of times the app has been in the foreground for at least two seconds. If the app is in the background and is later used again, that counts as another session.
Sessions totals are based on app users who agree to share their data with you. This data is anonymized and aggregated.
A：使用次数是应用启动到前台并至少保持2秒以上的启动次数。如果一个应用在后台被切换到前台，会算作另一次使用次数。（译者注：即启动时长超过2秒的启动次数 = App Analytics的使用次数）
使用次数的总数是基于同意与App开发人员共享诊断和使用情况的用户，数据会保持匿名并会加总。
A：Active devices counts the number of devices with at least one session during the selected period. Only devices with iOS 8 or later are included.
Active devices totals are based on app users who agree to share their data with you. This data is anonymized and aggregated.
A：使用中的设备是所选择的时间区间内，至少有一次使用次数的设备数。只有iOS8或以上的设备才会算。
使用中的设备总数是基于同意与App开发人员共享诊断和使用情况的用户，数据会保持匿名并会加总。
A：Installations count the total number of times your app has been installed on an iOS device with iOS 8 or later, including re-downloads on the same device, downloads to multiple devices sharing the same Apple ID, and Family Sharing installations. App updates are not counted.
Installations totals are based on app users who agree to share their data with you. This data is anonymized and aggregated.
A：安装总数是你的App安装在iOS8或以上设备，包括重新下载到同一个设备，同一个Apple ID下的多个设备，或家庭共享导致的安装。App的更新不算。
安装总数是基于同意与App开发人员共享诊断和使用情况的用户，数据会保持匿名并会加总。
Q：为什么使用中的设备、使用次数和安装低于其他统计平台/工具，即使是过了72小时也如此？
A：To protect customer privacy, usage data is only reported from customers who agree to share their data. To estimate your total usage in App Analytics, simply divide the values reported in App Analytics by the opt-in rate for your app reported in the About Analytics Data help.
Q：什么是持续使用情况？（译者注：其实就是留存率，后面以留存率代替）
A：Retention measures the usage of your app over time. Retention consists of four components: the purchase date, devices, the retention period, and the retained devices.
Retained devices is how many devices that were active in a given retention period.
For example, your app was purchased 100 times on May 1, and 20 of those devices used your app on May 8. The purchase date is May 1, by 100 devices, the retention period is May 8, and there are 20 retained devices.
In this example, day 7 retention for apps purchased on May 1 is 20%, or 20 devices out of 100.
Note that whether these devices used the app on any day other than May 8 is not part of this calculation.
Retention totals are based on app users who agree to share their data with you. This data is anonymized and aggregated.
A：留存率，是衡量用户在一段时间的使用情况。留存率由4个部分构成：购买时间、设备、留存期、留存设备
留存设备：有多少个设备在那一天使用过App
例如，你的App在5月1日购买了100次，其中20个设备在5月8日用了你的App。则购买日期为5月1日，100个设备，留存期是5月8日，有20个设备留存。
在这个例子中，5月1日购买App的7日留存是20%，即100个设备中有20个。
注意：这些设备是在5月8日意外的时间使用了App，并不在这个计算的考虑范畴内。
留存数是基于同意与App开发人员共享诊断和使用情况的用户，数据会保持匿名并会加总。
译者补充：
A：汇总一下原因：
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原文地址：http://www.cnblogs.com/yunxinxi/p/4639079.html
