To determine the number of strata is commonly used expression:
being 
cost per unit cost per stratum. The problem with this formula is that it is not operational because it depends on the size of the sample.
In general the accuracy increases with the number of layers if these are well chosen, but it is not his number if produgar such increase does not compensate for the complications of calculation. Clearly the maximum number of layers must be
to estimate the variances in each stratum, and is generally recommended to take less than 6 layers.
cost per unit cost per stratum. The problem with this formula is that it is not operational because it depends on the size of the sample. In general the accuracy increases with the number of layers if these are well chosen, but it is not his number if produgar such increase does not compensate for the complications of calculation. Clearly the maximum number of layers must be
to estimate the variances in each stratum, and is generally recommended to take less than 6 layers. 
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