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piecewise regression

a variant on ordinary least squares regression in which a regression line consisting of several different lines is fitted to the data. The several pieces have different slopes and meet at nodal points to form a continuous line. This approach is very useful for identifying abrupt changes or discontinuities in a process. For example, piecewise regression might be appropriate when a researcher is studying a group of participants before treatment, during treatment, and after treatment. Also called segmented regression.

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Psychology term of the day

January 3rd 2025

politeness

politeness

n. the process by which a speaker attempts to avoid harm to a listener’s public image or private self-concept through the use of nonthreatening or face-saving forms of speech. Politeness involves steering clear of content or forms of language that might embarrass listeners, make them feel uncomfortable, or lessen their self-respect. It also involves actively using language that maintains or enhances the listener’s dignity, prestige, and autonomy. For example, a speaker might preface the request for a favor by saying, “I’m sorry to bother you, and feel free to say no, but I wonder if you would. . . .” Politeness is one aspect of facework.