Correlation of 19 bioclimatic data

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Lale Amz

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Dec 18, 2019, 7:57:09 PM12/18/19
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Dear all MaxEnt users


I start working spatial distribution of an invasive species with MaxEnt.

As I read papers in this field, after preparing all variables and csv file, I should do a correlation between 19 bioclimatic variables of WorldClim

My question is how can I find data of 19 bioclimatic variables for correlation? where can i find data of 19 variables for analysis?



I really appreciate all of you


Lale

Diego Rueda

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Dec 30, 2019, 6:09:54 AM12/30/19
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Hello Lale,

Here is the link: https://www.worldclim.org/

Regards.

Diego

MaxentNoob

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Jan 2, 2020, 3:42:55 AM1/2/20
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Dear Lale,

please consider CHELSA:
In my opinion and according to several papers they are better suited in heterogeneous terrain, i.e. in mountain ranges.

Cheers,
Rainer

Lale Amz

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Jan 10, 2020, 2:41:27 PM1/10/20
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thank you so much  Diego
but my question is how can i find the correlations between variables?
i added all 19 bioclimatic variables in Arcmap and use "band collection statistics"
i attached it
i want to know is that correct or i made a mistack? Also i dont know which one of variables should be delete?

Best regards,
Lale
Worldclim.txt

Lale Amz

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Jan 10, 2020, 2:46:03 PM1/10/20
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thanks Rainer for your suggestion
i check Chelsea database but unfortunately in my case it doesn't have enough accuracy, for example bio1 in chelsea is -109 to 199 which is not correct for my site
Best regards,
Lale

gokwolf

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Jan 16, 2020, 11:49:46 AM1/16/20
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19 Aralık 2019 Perşembe 03:57:09 UTC+3 tarihinde Lale Amz yazdı:
Exercise_06_Predictors_-_Automated_vs_Thoughtful_Selection.docx

gokwolf

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Jan 16, 2020, 11:52:53 AM1/16/20
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-109/ 10 - 109/10   -10.9   -   19.9 ...  version 1.4 biobclimatic... but in version 2.0    ....

10 Ocak 2020 Cuma 22:46:03 UTC+3 tarihinde Lale Amz yazdı:

Leonardo Álvarez Santamaría

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Jan 16, 2020, 12:56:53 PM1/16/20
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Hello Gokwolf

I'm not familiar with land processes either with MaxEnt but one thing i'd consider is variables redundancy. 19 variables are to many i guess. It is that perhaps more than one variable would be telling you the same thing because of its physical meaning to the environment

Have a nice day



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Leonardo Álvarez Santamaría
Universidad Autónoma de Baja California Sur
Departamento Académico de Biología Marina
Carretera al Sur km 5.5
Col El Mezquitito
La Paz BCS
C.P. 23080
México
 
Tel 612 123 88 00 ext 4820

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gokwolf

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Jan 16, 2020, 5:23:26 PM1/16/20
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i can help you about that matter, if you send me presence points of the species...
do you think obly one variable responsible for every species's distribution?
no....
or.... udemy courses can help a lot...


16 Ocak 2020 Perşembe 20:56:53 UTC+3 tarihinde Leonardo Álvarez Santamaría yazdı:
Hello Gokwolf

I'm not familiar with land processes either with MaxEnt but one thing i'd consider is variables redundancy. 19 variables are to many i guess. It is that perhaps more than one variable would be telling you the same thing because of its physical meaning to the environment

Have a nice day



El jue., 16 ene. 2020 a las 9:49, gokwolf (<gok...@gmail.com>) escribió:


19 Aralık 2019 Perşembe 03:57:09 UTC+3 tarihinde Lale Amz yazdı:

Dear all MaxEnt users


I start working spatial distribution of an invasive species with MaxEnt.

As I read papers in this field, after preparing all variables and csv file, I should do a correlation between 19 bioclimatic variables of WorldClim

My question is how can I find data of 19 bioclimatic variables for correlation? where can i find data of 19 variables for analysis?



I really appreciate all of you






Lale

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Marcelo Bueno

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Jan 18, 2020, 12:09:19 PM1/18/20
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Hello Lale.

First, you need to export to excel and use only the matrix for Correlation Matrix.
Second, after open in Excel you need to use the option in the bar: Conditional Formation > Highlight Cells Rules > Greater than and Less than (to verify negative values).
You need to specify the value to find in the table. Usually in the papers are used 0.9 or 0.75 to avoiding multicollinearity between variables. Thus, after the numbers (cells) selected, you get to see and choose the variables and avoiding multicollinearity.

However, I prefer to use the VIF analyze in R.

I hope this information to be useful.

Good lucky
___________________________________________________________
Marcelo Leandro Bueno
Professor - Biologia Vegetal
UEMS - Unidade Mundo Novo

ALWAYS THINK POSITIVE & POSITIVE THINGS WILL HAPPEN



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