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# comaprison

## comaprison

(OP)
I am doing some random samples real mearsurmenst from an indoor enviornment  and I am using a software to simualte this enviornment to have the readings also , I want to see the effiecny of the software , what statistical paramterers of random variable are needed to comprate two results

(OP)

### RE: comaprison

You haven't described what you are trying to do well enough for us to help. Can you give the data you want to test?

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

### RE: comaprison

If the variables follow a normal distribution then compare the means and standard deviation with your software

corus

### RE: comaprison

(OP)
it is supposed to follow a rice or rayleigh distribution

### RE: comaprison

First find out what distribution do the samples belong to most likely. Then make statistical moments (first,second,...). Then you can find a possible trend, if there is some. Look for periodicity by finding autocorrelations and FFT. Construct an ARIMA model to find the level of randomness.
m777182

### RE: comaprison

Rayleigh is a bit problematical. Best bet is to rescale the x axis so that you get a symmetrical distribution, and then apply the t test etc. Alternatively go back to the mathematical derivation of the Rayleigh distribution and work out the probabilities from there. I don't know how practical that is.

You may find the chi square distribution applicable, directly to the data, but I've never used it.

Cheers

Greg Locock

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