A dataset containing example reliability test data from the military report "Reliability Growth Prediction" (1986) by The Analytical Sciences Corporation. This dataset includes cumulative ETI, failure counts, cumulative MTBF, report numbers, flags, and causes for two different LRUs (G1 and G2).
Format
@format ## testdata
A data frame with 25 rows and 6 variables:
- LRU
The Line Replaceable Unit identifier (G1 or G2).
- Cum_ETI
Cumulative Equivalent Test Hours (ETI).
- Failure_Count
Cumulative number of failures observed.
- Cum_MTBF
Cumulative Mean Time Between Failures (MTBF).
- Report_No
Report number associated with the failure.
- Flag
A flag indicating special conditions or notes.
- Cause
Cause of the failure (e.g., D for Design, M for Manufacturing, R for Random, NR for No Report).
@usage data(testdata)
Examples
data(testdata)
#> Warning: data set ‘testdata’ not found
head(testdata)
#> LRU Cum_ETI Failure_Count Cum_MTBF Report_No Flag Cause
#> 1 G1 4.9 1 4.9 23 1 D
#> 2 G1 17.8 2 8.9 4 1 D
#> 3 G1 33.4 3 11.1 6 1 D
#> 4 G1 75.3 4 18.8 12 1 D
#> 5 G1 84.0 5 16.8 13 1 D
#> 6 G1 215.0 6 35.6 25 1 D
summary(testdata)
#> LRU Cum_ETI Failure_Count Cum_MTBF
#> Length:25 Min. : 4.9 Min. : 1 Min. : 4.9
#> Class :character 1st Qu.: 215.0 1st Qu.: 4 1st Qu.: 31.3
#> Mode :character Median : 349.0 Median : 7 Median : 70.4
#> Mean : 780.3 Mean : 7 Mean : 89.7
#> 3rd Qu.:1503.0 3rd Qu.:10 3rd Qu.:143.4
#> Max. :2502.0 Max. :15 Max. :235.5
#>
#> Report_No Flag Cause
#> Min. : 2.00 Min. : 0.000 Length:25
#> 1st Qu.: 21.00 1st Qu.: 1.000 Class :character
#> Median : 36.00 Median : 1.000 Mode :character
#> Mean : 54.36 Mean : 7.609
#> 3rd Qu.: 98.00 3rd Qu.:14.500
#> Max. :125.00 Max. :28.000
#> NA's :2
str(testdata)
#> 'data.frame': 25 obs. of 7 variables:
#> $ LRU : chr "G1" "G1" "G1" "G1" ...
#> $ Cum_ETI : num 4.9 17.8 33.4 75.3 84 ...
#> $ Failure_Count: int 1 2 3 4 5 6 7 8 9 10 ...
#> $ Cum_MTBF : num 4.9 8.9 11.1 18.8 16.8 35.6 31.3 32.8 34.6 53.4 ...
#> $ Report_No : num 23 4 6 12 13 25 28 36 41 57 ...
#> $ Flag : num 1 1 1 1 1 1 1 NA 21 0 ...
#> $ Cause : chr "D" "D" "D" "D" ...