LABUTIL2: Stata module to manage value and variable labels

labutil2 is a bundle of programs to manage value and variable labels. labdu eliminates unused value labels or deletes values from value labels, labellist lists and returns contents of value labels attached to variables, labmm modifies multiple value labels, labmv changes numeric missing values to extended missing values preserving value labels, labrec modifies value labels and recodes variables accordingly, labvalch3 changes text in value labels, labvalcl clears value labels of null strings, labvalpool pools sets of value labels, labvars labels a list of varibles, txtlabdef defines value labels from a text file and uselab lists value labels together with variables using them. labcpy defines newlblname as a modified copy of oldlblname. labdeval defines a value label and attaches it to a list of variables. labren changes value label names. labmvs changes numeric values associated with strings to extended missing values. Numeric values are changed to successive extended missing value codes, starting with .a. Thus, the numeric value associated with the first string specified, will be coded .a, the value associated with the second string, .b and so on. Value labels are modified accordingly. labgen2 creates a new variable and labels it. The syntax is the same as with generate with the exception, that either a variable label, or option definition is specified additionally. labascii defines value labels from a plain text file that contains only ASCII characters. In filename each line, starting with a valid value label name, marks the beginning of a new value label. The lines in between define the integer-to-text mappings. Lines starting with non-integer numbers are skipped. Optionally a do-file, containing the value label definitions, is created. labrecode modifies value labels and recode variables they are attached to.