System information

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Blastware Compliance Module
Blastware Operator Manual 4–81
where the slope b is computed from the expression,
b = {  (x
i
* y
i
- n * x * y)} / {  (x
i
- n * x
2
) }
and the intercept a is computed from the expression,
a = y - b * x
The coefficient of correlation r is obtained by evaluating the expression,
r = {  (x
i
* y
i
- n * x * y)} / [{  (x
i
2
- n * x
2
)}{  (y
i
2
- n * y
2
)}]
1/2
and the sample standard deviation is evaluated from
s = [{( y
i
2
- n * y
2
) -  (x
i
* y
i
- n * x * y)
2
/  (x
i
2
- n * x
2
)} / n ]
1/2
In the equations above, n is the number of points (or Event PPV, SD pairs) x
i
and y
i
are the i
th
variable in the set i = 1 to n, and x and y are means or each of the variables in the given set.
(2)
A confidence line is based on the "rule of thumb" as a special case of Tchebychev's Rule. It states
that in a normally distributed large population approximately 68% of the members lie within one
standard deviation of the mean, whereas 95% of the members lie within two standard deviations.
For further reading, please see the following references.
Dowding, Charles H. BLAST VIBRATION MONITORING AND CONTROL. Englewood Cliffs,
NJ: Prentice-Hall Inc.,1985.
Federal Register, Vol.48, No. 46, Tuesday, March 8, 1983. RULES AND REGULATION.
Washington, D.C.: U.S. Government Printing Office.
Newbold, Paul. STATISTICS FOR BUSINESS AND ECONOMICS. Englewood Cliffs, NJ:
Prentice-Hall Inc.,1984.
Rosenthal, Michael F. and Gregory L. Morlock. BLASTING GUIDANCE MANUAL. Office of
Mining Reclamation and Enforcement (OSMRE), March 1987.
4.3.3 Post Event Notes
Select this command to view and change the Post Event Notes for an Event.
Editing notes for one Event only
To create or edit the note of a specific Event, select it in the Event List Box, and then select the
Edit Post Event Notes command, or the Notes icon from the Event Manager toolbar. The
following window appears:
Type in your notes and click the Apply to Event button when you are finished. Then click Exit to
close the dialog box.