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[?] Use seed random method for Empirical Distribution for RandomVariate?

decha promtem
Posted 4 years ago

Hello My name is Decha. I have question for " seed random method for Empirical Distribution for RandomVariate[dist]

Sample as follow Wolfram document.

data={3,9,3,6,0,0,5,1,3,9,7,8,3,5,3,2};

FindDistributionParameters[data,NormalDistribution[a,b]]

Map[BlockRandom[SeedRandom[1, Method -> #];

RandomVariate[NormalDistribution[a,b]]] &, {"Congruential", "ExtendedCA", "Legacy",
"MersenneTwister", "MKL", "Rule30CA"}]

It is ok. But for Empirical. it can not use. It can't work with Map of {"Congruential", "ExtendedCA", "Legacy","MersenneTwister", "MKL", "Rule30CA"}

It works only with

data={3,9,3,6,0,0,5,1,3,9,7,8,3,5,3,2};

dist = EmpiricalDistribution[data]

SeedRandom[7, Method -> ExtendedCA]

RandomVariate[dist]

I must change ExtendedCA to Legacy and to MersenneTwister. only one. It can't work with Map like a NormalDist or other.

Who know Map of random seed can work with Empirical Dist?

Thank you.

Decha
POSTED BY: decha promtem
2 Replies
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decha promtem
decha promtem
Posted 4 years ago

It work.
Very thank you Decha
POSTED BY: decha promtem
Hans Milton
Hans Milton
Posted 4 years ago

Documentation for SeedRandom mentions 6 "typical" random generators: Congruential, ExtendedCA, Legacy, MersenneTwister, MKL and Rule30CA.

The first, Congruential, does not seem to work well with RandomVariate[EmpiricalDistribution[data]]. In fact the kernel dies during evaluation.

But the last 5 works:

data = {3, 9, 3, 6, 0, 0, 5, 1, 3, 9, 7, 8, 3, 5, 3, 2};

In[2]:= Table[SeedRandom[1, Method -> k]; RandomVariate[EmpiricalDistribution[data]], 
             {k, {"ExtendedCA", "Legacy", "MersenneTwister", "MKL", "Rule30CA"}}
        ]

Out[2]= {8, 5, 3, 8, 3}

In another form, using Map:

In[3]:= Map[(SeedRandom[1, Method -> #]; RandomVariate[EmpiricalDistribution[data]]) &,
            {"ExtendedCA", "Legacy", "MersenneTwister", "MKL", "Rule30CA"}
        ]

Out[3]= {8, 5, 3, 8, 3}
POSTED BY: Hans Milton
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