How are group user stats calculated?

i normal user here (just gamer) not expert so wait better people explain to you better
but for what i see...
in page https://www.sgtools.info/sent/RePlayBe
you can see you give away some "Bundled" games,these in global SG contributor value can have "reduced value" or "0 value" it depend by the game,you can check in that page.

you also is Level 2
Level 2 is from $25 to $50
https://www.steamgifts.com/about/faq
https://www.steamgifts.com/discussion/XaCbA/list-of-all-cv-levels-and-their-corresponding-real-cv
From 25 to 50 is 24,99
$85/24,99=34.40 so why you get 35 value.

you can calculate how much it give to you in this way divide price of game \ with interval between levels
Example:
if price of a game on steam (usa) is $24,99
and your Level is 2
interval between level 2 and level 3 is = 24,99 (25,01 to 50) or ( 50-25,01) =24,99
So for calculate how much you will get you can do
price of game 24,99
divide finterval between level 24,99
so 24,99/24,99
Result = 1
so game will give you 1.00 contributor level point
BUT if you is at level 5:
level 5 to level 6 is $250.01-$500,
interval is $249.9 in Contributor Value
so 24.99/249.9
you will get around 0.10 Contributor Level point instead of 1
So level 2 you get 1 point,level 5 you get 0.10 etc.

in page https://www.steamgifts.com/stats/personal/community
you go down 4 times\fourth row "contributor level" if you put mouse cursor on line, you can see how much CV you earn with latests giveaways

And yes if u giveaway game multiple groups,in the groups value of game it's splitted,example you give away game value 20$,you get 10$ one group 10$ other group (at level 1)

About 0.3 i don't know too (i hope someone reply you so i learn it too),
i think maybe is related to "Reduced value" games or i don't know...just my stupid idea https://www.steamgifts.com/about/faq

Entries matter if you care Global SG GV stat,
because if not enough entry then giveaway don't give gv to you
entries not matter if you care only game $ value in a group stat

Useful links:
https://www.steamgifts.com/discussion/RqwrY/contributor-levels
https://www.steamgifts.com/discussion/RCZPq/reduced-cv-and-no-cv-giveaways

As i ssaid already i'm gamer\normal user here i'm not moderator or expert or dev so maybe i say wrong,you wait others explain to you better,but i try help little.

Well, I'm not staff but it does seem to be divided by the number of groups the GA was shared with: 4 games were shared with 3 groups and 2 games shared with 2 groups so: 4/3 + 2/2 = 2.3.
Same thing with game value as far as I can see.

https://www.sgtools.info/sent/RePlayBe (useful tool)

As iTA mentioned above, it is a good idea to read the FAQ if you haven't yet. It gives a breakdown of how Contributor Value is affected (depending on if a game has full value or not):

Games fall into one of the below three categories.
.

1. No Value:
   No contributor value when given away after the effective date.
2. Reduced Value
   15% contributor value when given away after the effective date.
3. Full Value
   100% contributor value when given away.
   .
   If you visit your profile, you can see a breakdown of your previous giveaways. If you hover over the "Gifts Sent" number on your profile, you'll see the number of gifts you have given away in each category.
   .
   For example, you give away three games. Game A is $10.00 and it has no value. Game B is $20.00, and it has reduced value. Game C is $50.00 on Steam, and it has full value. Once your giveaways have ended and the gifts have been received by their winners, you will see the updated values on your profile. In this case, you would see "Gifts Sent: 3 ($80.00)". This would show that you have successfully given away 3 gifts, and their current list price on Steam is $80.00 in total. If you hover over the number of gifts, you would see you have one "No Value" gift, one "Reduced Value", and one "Full Value". If you hover over the dollar value, you would see you have a contributor value of $53. It would be calculated as 0% of the gift with no value (0 x $10.00 = $0.00) + 15% of the gift with reduced value (0.15 x $20.00 = $3.00) + 100% of the gift with full value ($50.00).

View attached image.

View attached image.

When you share GA for some groups, stats counts depend from in which groups winner was.

For your other question, I believe (I might be wrong, this is just what I think from my experience) if there are no entries the giveaway does not count, but if there is even 1 it does.

It seems that the space translator did not understand the intent of the question well.
However, the premise of the story seems to be the use of such a function.

Group Pages
https://www.steamgifts.com/discussion/gHolE/group-pages

[Example]
S.Gifts
https://www.steamgifts.com/group/SJ7Bu/steamgifts/users

User
Sent/Received Gift
Difference/Value Difference

If you are part of a group involved in SG, I am sure you can check such information of other users.
https://www.steamgifts.com/account/steam/groups