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    i understand the difference between the two - e.g. consistency vs accuracy, but in my evaluation of this particular essay i am struggling to identify whether it lacks validity or lack reliability:

    In addition to this, Cotton et al (2009) found that female patients typically function better than males, this may explain why the occurrence of SZ is reportedly much higher in men – as woman may escape diagnosis because their better functioning skills may bias practitioners to under-diagnose SZ. This presents a major problem as men and women with similar symptoms may receive completely different diagnosis’.

    ^^^ is this a validity or reliability problem? thank you!

    (i feel like it's validity but i want to make sure)
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    Validity. The diagnostic criteria are failing to accurately identify those who suffer SZ. They therefore are measuring levels of functioning rather than SZ which means they lack validity.
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    If it lacks validity, it also lacks reliability.
 
 
 
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