Lines Matching refs:xbar
725 def variance(data, xbar=None): argument
768 T, ss = _ss(data, xbar)
816 def stdev(data, xbar=None): argument
828 var = variance(data, xbar)
883 xbar = fsum(x) / n
885 sxy = fsum((xi - xbar) * (yi - ybar) for xi, yi in zip(x, y))
911 xbar = fsum(x) / n
913 sxy = fsum((xi - xbar) * (yi - ybar) for xi, yi in zip(x, y))
914 sxx = fsum((xi - xbar) ** 2.0 for xi in x)
955 xbar = fsum(x) / n
957 sxy = fsum((xi - xbar) * (yi - ybar) for xi, yi in zip(x, y))
958 sxx = fsum((xi - xbar) ** 2.0 for xi in x)
963 intercept = ybar - slope * xbar
1073 xbar = fmean(data)
1074 return cls(xbar, stdev(data, xbar))