What is internal and external validity?

What is internal and external validity?

The internal validity thus ensures that the change in a dependent variable can actually be traced back to the independent one and confusions between the independent and an interfering variable can be excluded. This fact describes the external validity.

What does external validity mean?

External validity is concerned with whether the results of your research can also be applied to the entire population or to other situations, groups or people. For external validity, the internal validity of your scientific work must first be given.

What are external sources of information?

External sources of information. The external sources of information must be researched and searched. This is information that is new to the company and therefore brings with it both opportunities and disadvantages. The external sources of information can still be divided into primary and secondary.

What is internal marketing?

Internal mindset: Internal marketing assumes that marketing is not only a classic corporate function, but also a guiding principle. Marketing is therefore a corporate philosophy that is supported by all managers and employees and must be lived both internally and externally.

What is External Marketing?

Corresponds to classic marketing. It is aimed at people and organizations outside the company, mainly it is aimed at current and potential -> customers, whereby -> customer satisfaction and -> customer loyalty are important goals.

What does information sources mean?

A source of information can be all those places where original facts, first informants, eyewitnesses or first allegations, etc. are available.

What are internal sources of supply?

Internal sources of supply evidence: supplier index, article index, available offers, available catalogs, available price lists, available documents from representative visits.

What are sources of supply?

Hyphenation: reference | source, plural: reference | source. Meaning of the word / definition: 1) virtual or actual place at or from which ideal or real goods can be bought, ordered or obtained.

What is validity?

Validity Definition The validity refers to the validity of your research. A measurement is internally valid if it actually measures what it is supposed to measure and thus delivers credible results.

What does internal validity mean?

Internal validity definition This means that your results can also be applied outside of your research. Reliability is also a prerequisite for your scientific work. This is about whether your research is reproducible.

How can you measure validity?

The definition is: The quality criterion validity describes the validity of a measurement, ie whether what was measured was what should be measured. Tests, surveys and examinations are therefore valid if they measure what they are supposed to measure.

When is a questionnaire valid?

Validity. A questionnaire is valid if it measures exactly what a company really wants to know. Objectivity and reliability are the prerequisites for a valid questionnaire.

When is reliability good?

Values ​​from 0.7 are considered acceptable, from 0.8 as good (Bühner, 2011). Another measure of internal consistency can be calculated using the split-half method, in which the test is divided into two parts and the correlation of the two parts is reported as a value for internal consistency.

What are test criteria?

Criteria that can be used to judge how good a psychological test is. In general, a distinction is made between the criteria of objectivity, reliability and validity. Reliability is given if the test also reliably measures what it measures.

What is meant by reliability?

The reliability of a measurement method indicates the extent to which measurement results that are obtained under the same conditions with identical measurement methods (e.g. in the case of repeated measurements) agree. It is often calculated as the correlation between two series of measurements.

What is the parallel test method?

Parallel test, a test that has a pair, ie there is a second, completely equivalent form of a test. The test can thus be repeated on the same test person, for example, in order to measure the progress of the exercise. Parallel tests are a method of empirically assessing the reliability of a test.

What are secondary quality criteria?

Secondary quality criteria are desirable but not necessary criteria for a test. It should be useful, economical, comparable and standardized (economy, usefulness, standardization).

Why is objectivity a prerequisite for reliability?

Objectivity as the basis for reliability. Here the influences are bilateral. If measurements are heavily dependent on the researchers involved, then they are less accurate. Results then spread more widely, as the different people generate additional variance in data collection, evaluation and data interpretation.