Statistics Terms
In-Line Inspection
Concepts
Descriptive Statistics
100

The sum of the values divided by the number of measurements

Mean or Average

100

The acronym P.O.D stands for this.

Probability of Detection

100

The main thing we have been talking about

Statistics

100

Two main aspects of data that a descriptive statistic could summarize

Central Tendency and Variation

200

The term for a set of observations drawn from a population.

Sample

200

None of these are in an ILI report

Missed Anomalies

200

A number that is always between 0 and 1 (or equivalently between 0% and 100%)

Probability

200

A distribution with two peaks

Bi-modal

300

The ratio of the standard deviation to the mean

Coefficient of Variation

300

A range that is likely to contain the value we seek

Confidence Interval

300

Using probabilistic methods to compare a structure's stress to its strength

Structural Reliability

300

The mathematical sign for left-skewed data or distribution

Negative skew

400

A term for the value of a variable taken during one of the experiments. 

Observation

400

Distribution shapes get shorter and wider as this gets bigger

Uncertainty

400

A branch of statistics named after an English Presbyterian minster who died in 1761

Bayesian Statistics

400

The extension of descriptive statistics, which tries to reach conclusions that extend beyond the immediate data alone

Inferential Statistics

500

The square root of the average squared distance from the mean

Standard Deviation

500

A type of regression for binary data

Logistic Regression

500

The value of the area under the curve of every distribution

One

500

Distributions with data in the tails that is less extreme than a normal distribution have this.

Low kurtosis