EXCEL as Risk Analysis Software
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Charleston-Joseph OrbeMember for 21 years 3 months
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Oldest first- 0CSChachrist Srisuwanrat ·Dear guys
I uses Excel to do risk analysis based on activity duration. My Excel file shows the probability of project completion and also criticality level for each activity (based on time). Let’s me know if anyone is interested, i think i can make an easy version to show you guys. - 0CSChachrist Srisuwanrat ·please goto
http://www.chachris.com/index_files/excel.htm
or
http://chachrist.googlepages.com/RiskAnalysis.pdf
I wish I have time to show you guys more. Anyway, this should give you an idea how to do this in EXCEL.
By the way, please check PERTMASTER and @RISK software. These two companies have add-on application for EXCEL, MS PROJECT,and P3 sebjected to RISK ANALYSIS - 0CSChachrist Srisuwanrat ·Guys I have a question.
What if I make an excel application for the risk analysis as shown in my website (with more feather such as SS and FF relationships and optimizing cost), how much money I could sell it? I just wonder. Anyone would buy is for $50 ??
http://www.chachris.com/index_files/excel.htm
- 0CSChachrist Srisuwanrat ·Dear my friend
You should be able to find this information documents related to productivity on the web.
Or you can do some experiment by yourself. Do the job for 10 times then get average and SD value. :)
Or ...well...if there is any book about construction productivity in India, which usually provides mean value, you can use the mean value and try set SD = 10%, 20%, and 30% of the mean value. Heheheee this sound super fun to me. - 0CSChachrist Srisuwanrat ·you can use any distribution you want as long as you have the function in Excel (either built-in or from other commercial software such as @Risk by Palisade decistion tool). There are some built-in distributions in Excel:normal, gamma, exponential, and hypergeometric.
The example on my webpage is just to show how to do risk analysis using simulation (numerical approach) in Excel.
About standard deviation (also the same for distribution, it depends on manay factors such as what type of activity, is it lobor or machine intensive, site condition, weather. In order to select a proper distribution and SD, I suggest you to collect some real data that is considered a good representation for your project(in term of the mentioned factors above) and then use some fit curve distribution software such as StatFit in ProModel, or ...other software to get distribution and its parameters.
Well, or you can try to find information from publication on the web.
Or, hmm just use normal distribution with mean from RSMeans Building Construction Cost Data and use SD of 10%, 20%, ... of the mean, just to get the picture of risk.
- 0WMWaleed Mahfouz ·DEAR Chachrist Srisuwanrat,
I didn’t mean which distribution you select, I do mean that why you select normal distribution, that was the first question.
And how can I calculate the standard deviation’s value?
is it just collect some data and get the equation by curve fitting? I think it will be more efficient if you collect the different types of risks, sort them and select a suitable risk weight, allocate the to each activity, and get the final degree of risk assigned to each activity. So i will be more realiable, but more complicated. isn’t it?
- 0CSChachrist Srisuwanrat ·I choose normal distribution in my example just for the sake of simplicity.
BTW, i am quite interested in what you said "collect the different types of risks, sort them and select a suitable risk weight, allocate the to each activity, and get the final degree of risk assigned to each activity." However, to be honest, this is something beyond my current knowledge. I will try to time to study your suggestion. Do you have any book you want to recommend me about the topic? - 0WMWaleed Mahfouz ·Thank you for your reply, and I will search for some good topic documents in this topic. In addition, I can help you in developing this project, as I am also interested in this branch of science. On the other hand, I can Simulate different types of probability distribution that represent the most optimistic and the most pessimistic as well.
I will be ready.
- 0RMRaphael M. Dua ·Bipresh
If you really want to do proper Risk analysis where the formulae have been tested and the people who creted it actually know what they are doing try the following URL
http://www.projchallenge.com/solutions_presentations/Mark%20Swabey%20v%20web.ppt
I have seen this product and reckon it beats all the rinky dink Excel macros that exist
Raf - 0RMRaphael M. Dua ·Guys
I gave you the web address in my previous post
www.decisivetools.com
download a 30 day trial to see for yourself.
iDecide is an award-winning software program for decision and risk analysis. With iDecide you can quickly build influence diagrams describing the risk or decision and then run Monte Carlo simulation. The result is a statistically accurate representation of the range and likelihood of all possible outcomes. In other words, iDecide gives you the power to handle risks and decisions like a professional.
Raf - 0CSChachrist Srisuwanrat ·thanks for the inputs from those who like and dislike my simple RISK Analysis macro. I didnt plan to make it as an end product. My macro and the code should be viewed as a starter. It should show you how to make a simple simulation out of MS Excel and MS Project.
By the way, sorry I didnt write the manual, since I believe we all can figure out how it works.
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