常见问题－ 请问Pooled StDev如何计算？
请多指教---
Two-sample T for a vs b
N Mean StDev SE Mean
a 6 18.19 6.00 2.4
b 6 18.01 4.42 1.8
Difference = mu a - mu b
Estimate for difference: 0.77
95% CI for difference: (-5.94, 7.49)
T-Test of difference = 0 (vs not =): T-Value = 0.26 P-Value = 0.802 DF = 10
Both use Pooled StDev = ( )
请问Pooled StDev如何计算？
Two-sample T for a vs b
N Mean StDev SE Mean
a 6 18.19 6.00 2.4
b 6 18.01 4.42 1.8
Difference = mu a - mu b
Estimate for difference: 0.77
95% CI for difference: (-5.94, 7.49)
T-Test of difference = 0 (vs not =): T-Value = 0.26 P-Value = 0.802 DF = 10
Both use Pooled StDev = ( )
请问Pooled StDev如何计算？
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aymjwwl (威望:0)
赞同来自:
S=SQRT(sum((n1-1)S1^2+...+(ni-1)Si^2)/(n1+...+ni-i)))
S1...Si分别为i个样本的标准偏差