Hi there

I am trying to create a function that will grab random values from a
given distribution (lognormal and beta in particular). I am currently
using the following code for lognormal:

dblValue = Application.WorksheetFunction.LogInv(Rnd(), v1, v2)

where v1 is my mean and v2 is my standard deviation. But each time I
try to run it, I get the error "Unable to get the LogInv property of
the Worksheet Function class"

Any suggestions?


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leebean337
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What are the values in V1 and V2 when that line runs?

V2 better be greater than 0.

leebean337 wrote:

Hi there

I am trying to create a function that will grab random values from a
given distribution (lognormal and beta in particular). I am currently
using the following code for lognormal:

dblValue = Application.WorksheetFunction.LogInv(Rnd(), v1, v2)

where v1 is my mean and v2 is my standard deviation. But each time I
try to run it, I get the error "Unable to get the LogInv property of
the Worksheet Function class"

Any suggestions?

--
leebean337
------------------------------------------------------------------------
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--

Dave Peterson

Hey,

v1=8500 (mean)
v2=3000 (sd)

I figured out the first part of the problem, that being that my values
are too large and excel can't handle the resulting figures.

Also, when I change v1=ln(8500) and v2=ln(3000) I end up with a result
(and even a decent one!)

But I'm still concerned that I'm not actually suppose to modify my
specified mean and sd. What do you think?

Thanks


--
leebean337
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It's been way too long since my last stats course.

But maybe someone will chime in.

leebean337 wrote:

Hey,

v1=8500 (mean)
v2=3000 (sd)

I figured out the first part of the problem, that being that my values
are too large and excel can't handle the resulting figures.

Also, when I change v1=ln(8500) and v2=ln(3000) I end up with a result
(and even a decent one!)

But I'm still concerned that I'm not actually suppose to modify my
specified mean and sd. What do you think?

Thanks

--
leebean337
------------------------------------------------------------------------
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--

Dave Peterson

See Help for LOGINV. You are attempting to calculate EXP(8500+3000*x) where
it should be true that ABS(x)<38.

EXP(8500) is about 12 orders of magnitude larger than the largest number
that Excel can calculate.

Jerry

"leebean337" wrote:


Hey,

v1=8500 (mean)
v2=3000 (sd)

I figured out the first part of the problem, that being that my values
are too large and excel can't handle the resulting figures.

Also, when I change v1=ln(8500) and v2=ln(3000) I end up with a result
(and even a decent one!)

But I'm still concerned that I'm not actually suppose to modify my
specified mean and sd. What do you think?

Thanks


--
leebean337
------------------------------------------------------------------------
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What version of Excel? Try just Application.LogInv(). Version of Excel
prior to 97 did not support the WorksheetFunction keyword.

Jerry

"leebean337" wrote:


Hi there

I am trying to create a function that will grab random values from a
given distribution (lognormal and beta in particular). I am currently
using the following code for lognormal:

dblValue = Application.WorksheetFunction.LogInv(Rnd(), v1, v2)

where v1 is my mean and v2 is my standard deviation. But each time I
try to run it, I get the error "Unable to get the LogInv property of
the Worksheet Function class"

Any suggestions?


--
leebean337
------------------------------------------------------------------------
leebean337's Profile: http://www.excelforum.com/member.php...o&userid=31099
View this thread: http://www.excelforum.com/showthread...hreadid=507712