Function |
Description |
CHANNEL #/UNITS |
Selected channel CH #/ engineering units |
# OF POINTS |
n, including all uncompressed data points in and between the time marker and cursor |
MEAN |
SUM/n, average of data points from START TBF through END TBF |
STD DEVIATION |
Sqrt(VARIANCE) |
MINIMUM |
Lowest data value |
MEDIAN |
Middle value in array sorted by value, or average of two if n is even |
MAXIMUM |
Highest data value |
RMS |
Sqrt((SUM OF SQUARES)/n), or root mean square |
SUM |
Sum of n data values on channel CH |
SUM OF SQUARES |
Sum of n (data value)*(data value) on channel CH |
VARIANCE |
SUM OF SQUARES) - SUM*SUM)/(n-1) |
SKEWNESS |
3*(MEAN - MEDIAN)/(STD DEVIATION) |
SLOPE |
(sum of n (data value)*(# of half sample intervals from center))*6/(n*(n-1)*(n+1)*(sample interval)) = linear regression slope, where center = ((START TBF) - (END TBF))/2 is between samples if n is even |
AREA |
SUM*(sample interval = time interval between samples on channel CH) |
START TBF |
Time at first point in leftmost (possibly compressed) point |
END TBF |
Time at last point in rightmost (possibly compressed) point |
FILE |
Name of data file containing this data |
COMMENT |
Comment typed by user |