NCL ttest 检验有FillValue

phoebe

求助大神，在做ttest 检验时出现警告“warning:ttest: encountered 16176 cases where var1 and/or var2 were less than or equal to 0. Output set to missing values in these cases”，ttest 检验的Var1 和 Var2 值必须为正数吗？含有负数怎么办呢

timevigor

phoebe 发表于 2018-1-18 16:09
求助大神，在做ttest 检验时出现警告“warning:ttest: encountered 16176 cases where var1 and/or var2 we ...

Scalars or arrays of the same dimensionality as ave1 and ave2. They represent the variances calculated from two samples (i.e. sample variances).官网中的解释 其实就是方差 是每个样本值与全体样本值的平均数之差的平方值的平均数 按理正的才对