It is extremely important for a researcher to clearly define the variables in a study because this helps to determine the type of analysis that can be performed on the data. for example, if a researcher wanted to describe countriescountries based on isbn left parenthesis international standard bookisbn (international standard book number right parenthesis group identifiernumber) group identifier, what level of measurement would the variable "isbn group identifierisbn group identifier" be? now suppose the researcher felt that certain countries who were farthercountries who were farther northnorth received higher identifying numbersidentifying numbers. does the level of measurement of the variable change? if so, how?