(1) Exist a package to do something like
missing value analysis for a specific data.frame?

(2) Know anybody ,how it is possible check the data 
for plausibility from one respondend. So i would like 
identify critical fake respondents and clean them from further analysis..

In Conjoint-Mesaurement data,  a plausability test are done
with correlation - is something similar possible in a standard survey !?

..until now i didn't get a good idea which statistic-method could support me for
this? 

many thanks for any suggestions 
christian

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