NUR 80A/B Study Guide - Midterm Guide: Level Of Measurement, Frequency Distribution, Scatter Plot
23 Feb 2016
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Contingency tables: two-dimensional frequency distribution in which the frequencies of 2 variables are cross-tabulated, used with nominal data that have few levels or ranks, cross-tabulated data can be presented in 2 ways: Within each cell, percentages can be computed based on either. Correlation coefficient- numerical index that reflects relationship between 2 variables. Value of descriptive stats ranges between -1 and +1. Correlation between 2 variables is referred to as a bivariate (for 2 variables) correlation. Types of correlation coefficients: flavour 1 and flavour 2. Allow us to understand whether variables tend to move in the same or opposite directions when changing. Direct correlation (positive correlation)- variables change in the same direction. Indirect correlation (negative correlation)- changes in opposite directions. Absolute value of the coefficient reflects the strength of the correlation (a correlation of -0. 70 is stronger than +. 50; must u(cid:374)de(cid:396)sta(cid:374)d just (cid:271)e(cid:272)ause + does(cid:374)"t (cid:373)ea(cid:374) it has a st(cid:396)o(cid:374)ge(cid:396) (cid:272)o(cid:396)(cid:396)elatio(cid:374) tha(cid:374) a -)
