Eysenck's (1952) seminal work argued that clients receiving psychodynamic or eclectic therapy were comparable to, or even worse than, rates of remission of symptoms among untreated clients. His analysis of the data probably suffered from several threats to _______, including history, maturation, statistical regression, and selection biases.

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Eysenck's analysis of the data suffered from several threats to internal validity, including history, maturation, statistical regression, and selection biases. These threats may have affected the outcomes and thus the validity of his conclusions about the effectiveness of psychodynamic or eclectic therapy.

Eysenck's (1952) Seminal Work Argued That Clients Receiving Psychodynamic or Eclectic