<< Click to Display Table of Contents >> Navigation:  »No topics above this level« The end?

Here we are, time's up.

 

What have we talked about?

 

Items

cognitive and affective

 

Item pools

we got a bit into the deep end

may have been boring

 

Marbles and the binomial

having "all our marbles" is usually what we want

the binomial is neat

 

Samples and confidence intervals

bigger samples and better items reduce the size of confidence intervals

 

Reliability

 

we want to have it

it's really important

coefficient alpha is commonly used as the reliability figure for a test or survey

alpha is good when it's 0.80 or greater

low alpha may not always be the end of the world

we can forget about the total score and concentrate on results at the item level

but while this is true, good alpha is what everyone usually wants

 

Measurement error

 

we don't want it

but we can't get rid of it

bigger samples (longer tests) help to minimize it

 

Validity

several ways to measure it

many of them look at correlations with other tests or surveys

 

Coffee and donuts

 

Happiness

 

I thank you very much for your attention, and for the questions you asked (if you asked questions).