Bash Iterate through repeated values in file - bash

Question

I have a file with this format:
User_ID , Place_ID , Rating
U32 , 1305 , 2
U32 , 1276 , 2
U32 , 1789 , 3
U65 , 1985 , 1
U65 , 1305 , 1
U65 , 1276 , 2
I would like to iterate through this file, sort by Place_ID, iterate through repeated values in Place_ID and add the ratings, once the last element of the Place_ID is added, check if value > x and if true, push the Place_ID into an array.
Ex: Place_ID 1305: 2 + 1 / 2 = 1.5 > 1 ----> ids+=($id)
Place_ID 1276: 2 + 2 / 2 = 2 > 1 -----> ids+=($id)
I have tried with
test5 () {
id=0
count=0
rating=0
ids=()
ratings=()
for i in `sort -t',' -k 2 ratings.csv`
do
aux=`echo "$i"| cut -f2 -d','`
if (( $id != $aux )); then
if (( $rating != 0 )); then
rating=`echo "scale=1; $rating / $count" | bc -l`
if (( $(echo "$rating >= 1" | bc -l) )); then
ids+=($id)
ratings+=($rating)
fi
fi
id=$aux
count=0
rating=0
else
rating=$(($rating + `echo "$i"| cut -f3 -d','`))
count=$(($count + 1))
fi
done
echo ${#ids[#]}
echo ${#ratings[#]}
}
EDIT: I think it works, but is there a way to make it better? Something that doesn't force me to use as many if's and count.
Thanks for the help.

Answer 1

This is another option using less if's:
#!/bin/bash
sum=()
count=()
while read -r line; do
place=$(echo "$line" | cut -d',' -f2)
rating=$(echo "$line" | cut -d',' -f3)
sum[$place]=$(echo "$rating + ${sum[$place]-0}" | bc -l)
count[$place]=$((count[$place] + 1))
done < <( sed 1d ratings.csv | sort -t',' -k 2 | tr -d '[:blank:]' )
ratings=()
for place in "${!sum[#]}"; do
ratings[$place]=$(echo "scale=1; ${sum[$place]} / ${count[$place]}" | bc -l)
done
# ratings at this point has the ratings for each place
echo ${!ratings[#]} # place ids
echo ${ratings[#]} # ratings
I'm assuming your ratings.csv has headers that is why this has sed 1d ratings.csv