1 / 11

# Measurement - PowerPoint PPT Presentation

Measurement. 2011, 9, 8. Today’s Topics. Scale of measurement* Measurement reliability* Measurement validity**. Measuring a Variable. Nominal Scale: Mutually exclusive categories without order Political party: Democrat, Republican Gender: Male, Female

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Measurement' - ermin

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### Measurement

2011, 9, 8

• Scale of measurement*

• Measurement reliability*

• Measurement validity**

• Nominal Scale: Mutually exclusive categories without order

• Political party: Democrat, Republican

• Gender: Male, Female

• Ordinal Scale: Categories with rank order

• Social class: Upper, middle, lower

• Education level: High school, college, graduate

• Interval-Ratio Scale: the intervals between two consecutive categories are the same size

• Temperature

• Income

arbitrary zero

natural zero

• What is the difference between measurement unit and unit of analysis?

• An indication of the consistency or stability of a measuring instrument

• Free of random error

• Question 1: You took an IQ test twice in one day. In the morning, you received a below-average score of 85. So took it again in the afternoon. This time, you received a above-average score of 120. What is the problem of the IQ test?

• Question 2: I tend to be late because my watch is set 10 minutes behind. Is my watch reliable? What is the problem of the watch?

• Whether a measure is truthful or genuine

• Free of random error: Same result over and over

• Free of systematic bias: Accurate result

• Measures what it is designed to measure

• Need for Achievement scale

• Scale of measurement

• Nominal scale

• Ordinal scale

• Interval-ratio scale

• Reliability: Free of random error

• Validity / Accuracy:

• Free of random error

• Free of systematic bias

• Measures what it is supposed to measure