the degree to which an experiment measures what is supposed to measure is referred to as validity.
the degree to which an experiment measures what is supposed to measure is referred to as validity.
the degree to which an experiment measures what is supposed to measure is referred to as?
validity
convergent and discriminant validity are the two subtypes of validity that make up construct validity. convergent validity refers to the degree to which two measures of constructs that theoretically should be related, are in fact related. in contrast discriminant validity tests whether concepts or measurements that are supposed to be unrelated are, in fact, unrelated. take, for example, a construct of general happiness. if a measure of general happiness had convergent validity, then constructs similar to happiness (satisfaction, contentment, cheerfulness, etc.) should relate closely to the measure of general happiness. if this measure has discriminant validity, then constructs that are not supposed to be related to general happiness (sadness, depression, despair, etc.) should not relate to the measure of general happiness. measures can have one of the subtypes of construct validity and not the other. using the example of general happiness, a researcher could create an inventory where there is a very high positive correlation between general happiness and contentment, but if there is also a significant positive correlation between happiness and depression, then the measure's construct validity is called into question. the test has convergent validity but not discriminant validity.
construct validity
the "wind" spacecraft has an array of instruments including: konus, the magnetic field investigation (mfi), the solar wind and suprathermal ion composition experiment (sms), the energetic particles: acceleration, composition, and transport (epact) investigation, the solar wind experiment (swe), a three-dimensional plasma and energetic particle investigation (3dp), the transient gamma-ray spectrometer (tgrs), and the radio and plasma wave investigation (waves). the konus and tgrs instruments are primarily for gamma-ray and high energy photon observations of solar flares or gamma-ray bursts and part of the gamma-ray coordinates network. the sms experiment measures the mass and mass-to-charge ratios of heavy ions. the swe and 3dp experiments are meant to measure/analyze the lower energy (below 10 mev) solar wind protons and electrons. the waves and mfi experiments were designed to measure the electric and magnetic fields observed in the solar wind. all together, the "wind" spacecraft's suite of instruments allows for a complete description of plasma phenomena in the solar wind plane of the ecliptic.
wind (spacecraft)