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g0030 codebook A guide to the database that the researcher is creating—a guide sufficiently rich that it not only enables the researcher to code his or her data reliably but also allows others to replicate, reproduce, update, or build on the variables housed in the database, as well as any analyses generated from it. g0005 observable implications (or expectations or hypotheses) What we expect to detect in the real world if our theory is right. g0010 reliability The extent to which it is possible to replicate a measurement, reproducing the same value (regardless of whether it is the right one) on the same standard for the same subject at the same time. g0015 theory A reasoned and precise speculation about the answer to a research question. g0020 variable Observable attributes or properties of the world that take on different values (i.e., they vary). g0025 variable, values of Categories of a variable (e.g., male and female are values of the variable gender).