analogous and parametric estimating

One question from Rita is as follows:

A team member from R&D tells you that her work is too creative to provide you with a fixed single estimate for the activity. You both decide to use the labor hours from past projects to predict the future. This is an example of:

A) Parametic estimating
cool.gif three point
c) analogous
d) monte carlo.

I thought that since this involved a comparison to a past project it was Analogous but the ans says Parametric estimating. reasoning being hours per installation is a characteristics of parametric estimates.....

Now......

One question from Google questionbank

A project manager wants to make a trip to California by car. The project manager knows someone who has made this trip before. This person has a similar car to the one that the project manager has, and the person has kept good records on the money spent for fuel on the trip. The distance that the project manager will travel is 10% farther than the other person’s trip. By multiplying the cost of fuel reported by the other person by 1.1, the project manager is performing what kind of estimate?
a. Definitive
b. Analogous
c. Parametric
d. Quantitative

I tried to solve this along the same lines of the above question and thought the ans would be parametric as this also involves a mathematical formula being applied to it.
But here the ans is Analogous......

Why so??

Please help
 

A team member from R&D tells you that her work is too creative to provide you with a fixed single estimate for the activity. You both decide to use the labor hours from past projects to predict the future. This is an example of:

A) Parametic estimating
cool.gif three point
c) analogous
d) monte carlo.

Answer:


For me the correct answer is Parametric estimating. The reason is you are using past project's labor hours "to predict" the future. Predict the future is main word here. If it is analogous estimating, it would have mentioned differently. Here it uses some reference from past project to calculate something for current project.

One question from Google questionbank

A project manager wants to make a trip to California by car. The project manager knows someone who has made this trip before. This person has a similar car to the one that the project manager has, and the person has kept good records on the money spent for fuel on the trip. The distance that the project manager will travel is 10% farther than the other person’s trip. By multiplying the cost of fuel reported by the other person by 1.1, the project manager is performing what kind of estimate?
a. Definitive
b. Analogous
c. Parametric
d. Quantitative
 


Answer:


For me the correct answer is Analogous estimating. Here PM uses reference form past similar project and uses 'as it is' only modifying the difference between two projects. Here PM is not calculating anything based on past project. PM is not "predicting" any thing but just uses the data from past similar projects.


Regards,


 


PMP King

will , i think it's parametric estimating because you used units in your estimating , by multiplying the number by 1.1 is like you have extract mileage (galone/mile) from the first trip then you multiplied it by the second trip distance which means that you have used parametric estimating .

using analogous estimating you can count for defferencies in complexity,size , without trying to breakingout the past data .

ok ... I've read about it and i want to change my answer to analogous estimating because:

Analogous estimating takes the actual cost of previous, similar projects as a baseline and then adjusts for known differences (such as size, complexity, scope, duration, etc.)

so we took the data from the previous trip which is similar to the future trip(project)and then we adjusted it for size by multipling it by 1.1

in parametric estimation it doesn't need to be a similar project you just need to know a mileage for a car that's close to your's and then do your calculations .

 

Hi,


I also saw a similar query in other site. The key mantra is, the project manager starts with a base balue when using analagous estimate and then do the rest of the planning based on that, including minor adjustment.


 


Renji