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Measurement theory Flashcards

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2731402990Types of differentiationNominal (name) Numeral (# assignment w/o meaning) Number0
2731402991Measurement scalesNominal: "one or the other" (Y/N, M/F) Ordinal: categories that don't have equidistant measures than them (MMT) Interval: order and distance w/o an absolute zero (temp, months of the year) Ratio: origin, distance and order (gait speed, days since injury)1
2731402992Discreet measurementNominal, distinct categories2
2731402993Continuous measurementValues limited by measurement Taken with different degrees (sec v. msec)3
2731402994Frequency distributionNumber of times something appears in a data set4
2731402995Normal distribution68% of data falls w/in 1 standard deviation of the mean5
2731402996Positive skewTo the left Only a few people performed well6
2731402997Negative skewTo the right Only a few people performed poorly7
2731402998VarianceVariability around the mean8
2731402999When is a small variance warranted? Large variance?Small for scores close together Large for scores far apart9
2731403000Standard deviationBringing the variance back into same measurement as the mean10
2731403001Indication of a small standard deviation? Large?Small: group is homogeneous, more indicative that change has occurred Large: group is heterogeneous, harder to show change in population11
2731403002Correlation coefficientThe relationship between two things 0= none, 1=perfect12
2731403003Positive v. Negative correlationPositive: direct relationship Negative: indirect relationship13
2731403004Standard error of measurementReliability of response when data is normally distributed (The differentiation between true change and error)14
2731403005Norm reference standardCompare scores of individuals15
2731403006Criterion reference standardComparison of an individual to a standard16
2731455378Relative reliabilityThe degree with which measurements maintain a relationship when measured repeatedly Measured with ICC17
2731455379Absolute reliabilityThe variability of an individual score measured repeatedly Measured with SEM18
2731455380High or low: What type of ICC do you want? SEM?High ICC Low SEM19
2731455381Content validityThe extent to which a measure accurately represents a variable of interest20
2731455382Floor effectPt. is declining, but can't score any lower21
2731455383Ceiling effectPt. is improving, but can't score any higher22
2731455384ResponsivenessHow well does the tool measure the change?23
2731455385MDC v. MCIDMCD: Smallest amnt. of "true change" MCID: Smallest amnt. of MEANINGFUL change24
2731455386MCD or MCID, which is more critical for assessing the benefit of Txt?MCID25

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