This function checks
data.frames to be used by the confidence
package. The format has been specified in Van Loon (2014) and should
contain the following columns:
OBJECTID: water body code, e.g., NL89_os;
PAR: parameter, e.g., Cadmium;
DATE: date according to ISO 8601 (YYYY-mm-dd) for point values or year YYYY for annual means;
VALUE: numerical value.
TARGET: target value for the European Water Framework Directive;
UNIT: measurement unit of PAR. This unit should be the same for all records with the same PAR and is the same for both VALUE and TARGET;
transform: data transformation, i.e., log, logit, NA.
The function performs the following tasks:
checks availablitity of required columns (case insensitive);
make column names case-insensitive;
removes redundant spaces;
checks on missing values in required columns;
checks if DATE-field adheres to ISO 8601 (YYYY-mm-dd) or YYYY;
checks mixtures of annual averages and point values for a each year;
checks if measurement units are the same for a specific OBJECTID-PAR-pair;
checks if TARGET-value is the same for a specific OBJECTID-PAR-pair;
checks if transform is one of log, logit, NA in transform column;
checks that the EQR-column contains identical values fo each OBJECTID-PAR combination.
data.frame that has passed all checks
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