![]() ![]() ![]() ![]() Reliability and validity, jointly called the “psychometric properties” of measurement scales, are the yardsticks against which the adequacy and accuracy of our measurement procedures are evaluated in scientific research.Ī measure can be reliable but not valid, if it is measuring something very consistently but is consistently measuring the wrong construct. We also must test these scales to ensure that: (1) these scales indeed measure the unobservable construct that we wanted to measure (i.e., the scales are “valid”), and (2) they measure the intended construct consistently and precisely (i.e., the scales are “reliable”). Hence, it is not adequate just to measure social science constructs using any scale that we prefer. For instance, how do we know whether we are measuring “compassion” and not the “empathy”, since both constructs are somewhat similar in meaning? Or is compassion the same thing as empathy? What makes it more complex is that sometimes these constructs are imaginary concepts (i.e., they don’t exist in reality), and multi-dimensional (in which case, we have the added problem of identifying their constituent dimensions). The previous chapter examined some of the difficulties with measuring constructs in social science research.
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In scientific graphs, one almost never "connects the dots". That's why another name for trendline is best-fit line. It may or may not actually pass through any particular points. You should notice that the trendline is the best line that fits through the points. ![]() In the example above, we had Excel calculate and plot a linear trendline through the points. Experimental Design Project Toggle Dropdown.11 Reporting the Results of a Statistical Test.6 Scatter plot, trendline, and linear regression.5.6 Discussing statistics in your scientific writing.5.4 A test for differences of sample means: 95% Confidence Intervals.5.2 P and Detecting Differences in Variable Quantities.3.3 Calculating Descriptive Statistics using Excel.3.1 Describing Quantities and Their Variation.Excel Reference and Statistics Manual Toggle Dropdown.Appendix A: Calculation Final Concentrations.3.1 Specific details regarding scientific writing. ![]() ![]()
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