VALIDATION

Validation is the action and effect of validating ( making something valid , giving it strength or firmness ). The valid adjective, on the other hand, refers to that which has a legal weight or that is rigid and subsistent.

Validation

For example: "We have tried to verify the authenticity of the product , but the truth is that it did not pass the validation process" , "The owner has already carried out the validation of the project, which will be developed in the next few months" , "The program did not pass the validation process and, therefore, stopped working ” .

In the field of software creation , validation tests are the review process that a computer program undergoes to verify that it meets its specifications. The same, which usually takes place at the end of the development stage, is carried out mainly with the intention of confirming that the application allows to carry out the tasks that its potential users expect of it.

The tests of validation are also carried out to determine whether a software license is legal or if it is a forgery (a pirated copy). Some versions of the Windows operating system perform these validation tests automatically (without the user requiring it). When it happens that the process is not passed, the system itself warns the user that they could be the victim of a forgery.

The cross - validation , finally, is a practical statistical consists of fragmenting a sample of data subsets to analyze one and then validate the analysis with other subassemblies.

Validation methods

ValidationTaking as an example the field of analytical chemistry , which studies the composition of materials through laboratory tests, it is known that it is possible to use a validation method for a specific analyte (the element of interest in a sample), using a certain instrumentation, of the sample in question and carrying out a specific treatment of the data, and that this method can be applied in different laboratories with equivalent results, provided they meet the same equipment and personnel requirements.

There are different validation methods , which must be used after the development and optimization stage:

* Blind method : Using samples of known concentration of a particular compound, analysts can determine if they meet a specific set of requirements. Although this method depends to a large extent on those who carry it out, it is a practice of little complexity, that requires little time and that guarantees the impartiality of its participants. Three modalities can be distinguished:

+ zero blind : only one person intervenes;
+ single blind : carried out by two analysts;
+ double blind : three professionals participate, dividing the work in a very specific way. The first analyst is in charge of preparing the samples and performs, together with the second, the relevant analyzes . The latter has the task of comparing the results without knowing who each belongs to.

* Validation with reference materials : it is supported by a material standard or a sample that has been authenticated and the results that have been obtained with them; the condition is that there is an absolute match after validation. It is worth mentioning that these materials are distributed by various laboratories.

* Inter-laboratory comparison : it is the most widely used method, both for the validation of a method and for the preparation of reference materials. However, it carries a considerable economic and temporary investment.

* Comparison with an accepted method : similar to the last two, it consists of contrasting the results obtained by two validations in particular, using any of the three modalities of the blind method.

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