In lesson 23, we have defined reliability as the measure of stability of a test. We have also said that there are two main methods of determining reliability. This is repeated measurements and Internal Consistency method. Under repeated measurements, we have three main reliability tests: Test-retest, Alternative forms and equivalent forms.
Lesson 24 will discuss internal consistency methods of determining reliability. Internal consistency method of determining reliability indicates the degree of homogeneity among items in an instrument. It is estimated by determining the degree to which each item in a measure/instrument correlates with each other item in the same measure/instrument.
Internal consistency is based on a single administration of a measure. There are two types of Internal Consistency reliability:
- Split-Half and
- Alpha Coefficient methods
In this lesson, we shall discuss Split-half. This is where a measure is split into two before analysis to create two sets of tests. Each section is scored separately from the other section. Then a correlation coefficient is determined by correlating the two sets of scores.
This lesson will also demonstrate how to use SPSS to determine split-half. SPSS (Statistical Package for Social Science) is a software that analyses quantitative data.
Make sure you go through lesson 23 before lesson 24 so that there is coherence in your learning. This is the link to lesson 23 – https://youtu.be/8Pl9CXI23oo