RSI Value

Problem

Compute the Relative Strength Index over the last period price changes using simple averages: gain = mean of positive changes, loss = mean of absolute negative changes, RSI = 100 - 100 / (1 + gain/loss).

Return 100.0 when the average loss is zero, and None if period is not positive or there are not enough prices.

Hint

RSI above 70 is often read as overbought; below 30 as oversold.

Test cases

case 1

in: [[1,2,3,4,5],2]

expected: 100

case 2

in: [[5,4,3,2],2]

expected: 0

case 3

in: [[10,11,10,12],2]

expected: 66.66666666666666

case 4

in: [[5],2]

expected: null

Starter codePython

def rsi(prices, period):
    # Your code here
    pass

4 test cases · run your code against them in the editor