Thread: Margalef Species Richness...

Margalef's richness index: (S-1)/ln(n), where S is the number of taxa, and n is the number of individuals.
Hi all, this may seem pretty simple to you all, but I admit that when it comes to numbers I struggle.
Please correct me where I (may) be getting this wrong:

[(S-1)/ln] x n = answer
My struggling point is, what is 'ln' I can't seem to find this anywhere (is it simply 1-n?).
Thanks for your help!

Originally Posted by nurglespuss

Margalef's richness index: (S-1)/ln(n), where S is the number of taxa, and n is the number of individuals.
Hi all, this may seem pretty simple to you all, but I admit that when it comes to numbers I struggle.
Please correct me where I (may) be getting this wrong:

[(S-1)/ln] x n = answer
My struggling point is, what is 'ln' I can't seem to find this anywhere (is it simply 1-n?).
Thanks for your help!

Hi,
the formula is . The " " is a function called the natural logarithm. You can find this function on scientific calculators (usually, it is on the same key as ).

Ahhhh my brain finally works, its not 1n its ln (log).
Cheers :>

Originally Posted by nurglespuss

Margalef's richness index: (S-1)/ln(n), where S is the number of taxa, and n is the number of individuals.
Hi all, this may seem pretty simple to you all, but I admit that when it comes to numbers I struggle.
Please correct me where I (may) be getting this wrong:

[(S-1)/ln] x n = answer
My struggling point is, what is 'ln' I can't seem to find this anywhere (is it simply 1-n?).
Thanks for your help!

hi all,

I was hoping you could tell me the which button I should be pushing on my calculator for the Margalef species richness index.

I have both the Log and In buttons on my calcualtor

is it correct if I type in S-1/Log(n
or is it S-1/In(n

thanks in advance

Adrian

Originally Posted by AdrianWool

hi all,

I was hoping you could tell me the which button I should be pushing on my calculator for the Margalef species richness index.

I have both the Log and In buttons on my calcualtor

is it correct if I type in S-1/Log(n
or is it S-1/In(n

thanks in advance

Adrian

ln, that is, the log to base e button.


Note to members: This thread has contextual relevance to the Advanced Probability and Statistics subforum, even though there is no explicit stats question being asked. eg. see WCS Malaysia Program - Study design and data analysis for more information on this index.