522 POSTS

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### Odds Ratio

Odds Ratio is a numerical quantity that tells us whether the chances of an event occurring are more when we are part of a certain as opposed to when we are not a part...

### Normal Approximation to Binomial Distribution

The normal approximation means that you can use the normal distribution as an approximation to calculate the probabilities for binomial distribution. Note that this can be done under the following conditions: The number of trials...

### Snowball Sampling

Snowball sampling is a sampling technique where we use the existing people in our sample to recruit more people in order to increase the sample size. This is like a snowball that on rolling...

### Scales/Levels of Measurement

Scales of measurement (levels of measurement) refers to the fact that there are appropriate types of measurement to use depending on the kind of data that we are given. The four kinds of scales...

### y hat- Definition/How to Find

y hat (symbol: ŷ) refers to the value for the dependent variable that we obtain from a linear regression model. Note that it is merely the value that we have predicted using our linear...

### Class Midpoint/Class Mark

The class midpoint (also called the class mark) is defined to be the average of the upper and lower values of a given class interval. The use of the class midpoint in a frequency...

### Fixed Effects & Random Effects

Whenever we do any linear regression or apply an ANOVA test we can have two different kinds of models – fixed effect models and random effect models. If our model consists of a mixture...

### Systematic and Random Errors

Whenever we measure any physical quantity using an instrument there is always an error associated with it. Such errors are of two kinds – Systematic error and Random error. Systematic error: Systematic errors are errors which...