Discrepancy in Google Analytics data when using segments -


i'm having tough time google analytics, trying understand why value of metrics changes when segments applied.

there standard audience overview report, based on 100% of sessions (no sampling) , view not filtered. period march of 2017.

standard "all visitors" segment looks this:

enter image description here

then, there built-in segment called "bounced sessions". when apply segment, "all visitors" values changes:

enter image description here

amount of users increases, count of pageviews decreases.

any ideas how explain this?.. thank in advance!

oki, there can be, multiple reasons. let me explain first how these numbers calculated, move on query.

there 2 types of data gathering , manipulation google.

pre-calculated data -- pre-aggregated tables

these precalculated data google uses speed ui. google not specify when done can @ point of time. these known pre-aggregated tables

data calculated on fly

some result in computation or manipulation falls under category. using segments, creating custom reports etc.

coming problem. when apply segment, every metric effects calculated again. may result in numbers greater see in normal view.

standard audience overview report pre-aggregated @ point of day. when apply segment, results calculated fresh data. since latter latest, automatically give increased number of metrics. can see decrease well, depends on data , user behavior.

resolution: if premium user, use big query. must rely on big query every metric fresh , calculated on fly

i work senior analyst, , common issue resolve clients. hope cleared doubt. please feel free ask more.


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