How many observations are in this data set

In statistics, anobservation is simply one occurrence of something youre measuring.For example, suppose youre measuring the weight of a certain species of turtle. Each turtle that

How many observations are in this data set

In statistics, anobservation is simply one occurrence of something youre measuring.

For example, suppose youre measuring the weight of a certain species of turtle. Each turtle that you collect the weight for counts as one single observation.

The following dataset contains the weight of 15 different turtles, so there are 15 total observations:

When viewing a dataset in statistical software like Excel, R, Python, or Stata, the number of rows in the dataset is equal to the number of observations.

For example, a dataset with 100 rows has 100 observations.

Its also interesting to note that a single observation can be associated with multiple variables. For example, in the following dataset there are 15 observations and 3 variables:

Example of observations in statistics

The first observation has the following values for the three variables:

  • Weight: 290 pounds, Length: 30 inches, Region: East
Observation in statistics

The second observation has the following values for the three variables:

  • Weight: 296 pounds, Length: 35 inches, Region: East
Observation in statistics

And so on.

Its also worth noting that the total number of observations is equal to thesample size of the dataset. For example, a dataset that has 100 observations has a sample size of 100.

Additional Resources

Descriptive vs. Inferential Statistics: Whats the Difference?
Population vs. Sample: Whats the Difference?
Statistic vs. Parameter: Whats the Difference?

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