Using Confidence Interval to Indicate Sample Validity |
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HPjmeter uses a confidence interval to give you a real-time view of the current accuracy of certain
metrics.
For example, the Java Method HotSpots window shows
the confidence interval numerically as a plus-or-minus percentage
that appears just to the right of the measured value. A gray diamond
underlies the text to show a graphical representation of the confidence
level.
The horizontal positioning of each gray diamond
represents the measured value in relation to the other measured values
in the display. The width of the diamond represents the percent confidence
interval. The real value measured lies somewhere within the range
of confidence represented by the diamond.
During a live session, the width of the confidence
interval shrinks over time as the statistical confidence in the value
increases.
This example shows a high confidence in the results,
denoted by the narrow gray diamonds in the display.
This example shows low confidence in the results,
denoted by the wide gray diamond shapes.
Until the algorithm can show the data with confidence,
the graphical confidence interval is displayed as a gray bar showing
only relative relationship.