Lines Matching refs:items
41 def sum(items):
42 return reduce(lambda x,y: x+y, items)
44 def arithmeticMean(items):
45 return sum(items) / len(items)
47 def standardDeviation(mean, items):
48 deltaSquares = [(item - mean) ** 2 for item in items]
49 return math.sqrt(sum(deltaSquares) / (len(items) - 1))
51 def standardError(stdDev, items):
52 return stdDev / math.sqrt(len(items))
64 def twoSidedConfidenceInterval(items):
65 mean = arithmeticMean(items)
66 stdDev = standardDeviation(mean, items)
67 stdErr = standardError(stdDev, items)
68 return tDist(len(items)) * stdErr