Death Of Soldiers In Iraq During Gulf War II
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1 Death Of Soldiers In Iraq During Gulf War II The field of reliability is concerned with identifying, predicting, and preventing failures. One way to make reliability obvious is to prepare Crow/AMSAA plots of cumulative failures versus cumulative time. Crow/AMSAA methodology is useful for mixed failure modes, which means the cause for the failures can be by many different reasons. When improvements have occurred, a cusp will appear on the trend line signifying failures are coming more slowly (if improvements are being made). Or the failures may be coming more quickly (if the situation deteriorates to a less favorable condition). The interesting thing about Crow/AMSAA plots is stable processes give straight lines when plotted on log-log paper. The straight line can be regressed using simple curve fit techniques to forecast future failures. The slope (the beta value from the regression) of the Crow/AMSAA trend line is an important statistic as it tells if failures are increasing, decreasing, or floundering along with no deterioration or no improvement. The website has been publishing fatality statistics during Gulf War II. Obviously, deaths of soldiers represent failures. War deaths have mixed modes of failures. Crow/AMSAA plots should produce straight line plots on log-log paper and give a way to determine if: 1) failures are reducing (β<1), deteriorating (β>1), or without changes (β 1), 2) a cusp has formed on the trend line signifying improvement or deterioration, 3) predict future failures (deaths) of soldiers. Here are the statistics from Icasualties (which I have accepted as fact although that is frequently a risky thing to do with data from the Internet). Table 1 shows the December 25, 2008 Christmas Day score card with incomplete data for December 08. Revisions to earlier data continues.
2 Table 1: Fatalities In Iraq Cumulative Data For Crow/AMSAA Plots Fatalities In Iraq During Gulf War II USA Data UK Data Total Data Month US UK Other Total Month US Month UK Month Total March April May June July August September October November December January February March April May Jun July August September October November December January February March April May Jun July August September October November December January February March April May Jun July August September October November December January February March April May Jun July August September October November December January February March April May Jun July August September October November December January February March April May June July August Total Source: as of Christmas Day, December 25, 2008 US UK Other Total
3 A Crow/AMSAA plot of the data in Figure 1 (including incomplete month of December 08) with a single trend line for USA Data. The line slope shows casualties continue to increase: Figure 1: Total USA Fatalities Are Decelerating (see beta = 0.419) Zooming in on the top right hand portion of the trendline we see substantial reductions in fatalities following the troop surge announced January 10, 2007:
4 Figure 2: Recent USA Fatalities Extrapolated For Future Months The clear cusp on the current data is favorable and the decision for where the cusp is marked is made by engineering judgment. The post surge trend line moves horizontally to the right with fewer deaths over a long time interval! Compare the favorable line slope beta = with NASA s favorable trend line displayed for the space shuttle failures and it s beta = or compare the favorable cusps on accidents associated with Houston, TX light railroad before and after improvements the line slope beta = which clearly in not as good as shown in Iraq. Here s the sad forecast from Figure 2, we re going to loose more soldiers (but at a declining rate) in the Iraqi war. The goodness of fit criteria for the USA casualties is poor (P-value < 10%) and is just outside a good fit line based on a typical regression line rather than the IEC curve fit criteria. The equation for predicting future failures is: N(t)=λ*t β. You get λ and β from the regression analysis of data show on Figure 2. When the β value is > 1, failures (casualties) are coming more quickly, and when β value is < 1, failures are coming more slowly. Please note, I m not causing the forecasted fatalities (so don t send hysterical !), I m only predicting the outcome based on the data. I ll be happy to forecast fewer
5 failures if I can see objective evidence of meaningful improvements in short, show me the improvements don t tell me about the good things that could or might happen. We desperately needed a favorable cusp on the trend line to prevent the deaths of USA soldiers and we got it, now we need to even make more improvements to further reduce casualty rate in Iraq (by the way, I don t have a magic solution for how to accomplish this feat)!!! How many more deaths of soldiers do I want to see? the answer is ZERO, and how many more deaths will we have the answer is too many. Wars are dirty business to meet the objectives of peace. Where can you learn more about Crow/AMSAA plots: 1) The New Weibull Handbook by Dr. Robert B. Abernethy 2) WinSMITH Visual software by Fulton Findings for making reliability growth plots 3) Crow/AMSAA Reliability Growth Plots Problem Of The Month 4) MIL-HDBK-189 Reliability Growth Management 5) TR-652 AMSAA Reliability Growth Guide available for download from the November 02 Problem Of The Month 6) IEC (2004) Reliability growth Statistical test and estimation methods (55 pages (~US$190). Describes procedures to estimate the parameters of the power law model along with confidence intervals for failure intensity, and prediction intervals for the time to future failures along with a test of goodness of fit to data from repaired items. You can download a PDF copy of this by clicking here. The bottom line: Crow/AMSAA plots show cusps when failures decline to push the trend line to lower failure rates. Likewise, a cusp forms when failures increase and the trend predicts more failures. The main issue is to decrease failures. Comments: Refer to the caveats on the Problem Of The Month Page about the limitations of the following solution. Maybe you have a better idea on how to solve the problem. Maybe you find where I've screwed-up the solution and you can point out my errors as you check my calculations. your comments, criticism, and corrections to: Paul Barringer by clicking here. Return to top of page. Return to Barringer & Associates, Inc. homepage
6 Last revised 12/25/2008 Barringer & Associates, Inc. 2004
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