Post stratification weights

[karolinamg]

It should be highlighted that if you do not include all of your target population components that are outside of your sampling frame and you use post stratification weights for e.g., ratio estimation, it is not possible to calculate them from RDBES.

This is somewhat clarified at the end of pg. 28 of the documentation,

- When some components of the target population of each sampling level in RDBES are excluded from the sampling frame, they should be declared and, whenever possible, also quantified.
o E.g.: If the study population of the sampling programme is vessels <15 m i.e., a strata for >=15 m should also be declared and, if possible, quantified (see example 3) so this can be taken into account during estimation.

however, in table/example 3, pg. 29 we give conflicting information:

Simplified example of stratification by vessel size where one strata is out-of-frame (<10 m) and therefore does not need to be declared. Compare with example 2 where the VSid 6 with strata >=15 is in-frame but not sampled.

[HenrikK-N]

The Core Group are looking into this.