topic Re: proc corresp in Statistical Procedures

proc corresp

Ameurgen — Mon, 11 Dec 2023 20:21:28 GMT

species	shell_color	flesh_color
Otala_punctata	brown_beige	Gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	beige_black
Otala_punctata	white_brown_beige	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	white_brown	Black_gray
Otala_punctata	beige	Black_gray
Otala_punctata	white_brown	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	beige_black
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown	Black_gray
Otala_punctata	brown_beige	beige_black
Otala_punctata	brown_beige	beige_black
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown_beige	Black_gray
Otala_punctata	brown	Black_gray
Otala_punctata	brown_beige	Black_gray

Hi guys,

need i quick help please, here is above a cut for my data, and i need to apply the Multiple correspondence analysis (MCA) using proc correspbut this is my fist time and the syntax is so complicate, you know sas doc, also, i cant make a difference between Var statment and table statment.

i need to plot differents species by shell and flesh color.

Thank you all

regards

Re: proc corresp

PaigeMiller — Mon, 11 Dec 2023 20:32:26 GMT

The example here creates a similar plot to the one you are asking for.

https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.4/statug/statug_corresp_examples01.htm

Re: proc corresp

Ameurgen — Mon, 11 Dec 2023 20:38:16 GMT

Hi,

Do i need to encoding my data or just leave it, because with some code icoudnt get the scatter plot .

Thank you

Re: proc corresp

Ameurgen — Mon, 11 Dec 2023 21:18:36 GMT

proc corresp mca observed data=snails;
   tables  shell_color flesh_color;
run;

with this code doesnt work, please what im missing here. thank you

Re: proc corresp

ballardw — Mon, 11 Dec 2023 21:38:59 GMT

Doesn't work is awful vague.

Are there errors in the log?: Post the code and log in a code box opened with the "</>" to maintain formatting of error messages.

No output? Post any log in a code box.

Unexpected output? Provide input data in the form of data step code pasted into a code box, the actual results and the expected results. Instructions here: https://communities.sas.com/t5/SAS-Communities-Library/How-to-create-a-data-step-version-of-your-data-AKA-generate/ta-p/258712 will show how to turn an existing SAS data set into data step code that can be pasted into a forum code box using the "</>" icon or attached as text to show exactly what you have and that we can test code against.

Re: proc corresp

WarrenKuhfeld — Mon, 11 Dec 2023 21:42:51 GMT

Others have answered your questions so let me just add that the VAR statement is used when you want to read an existing table, and the TABLES statement is used when you want to create a table from raw categorical data (similar to but not identical to the TABLES statement in PROC FREQ).

Re: proc corresp

StatDave — Mon, 11 Dec 2023 22:09:23 GMT

If you want a plot and analysis for each species separately, then you probably just need a simple correspondence analysis as in the first part of the example titled "Simple and Multiple Correspondence Analysis of Automobiles and Their Owners" in the CORRESP documentation. For these data, the plot is just one dimensional.

Re: proc corresp

Ksharp — Tue, 12 Dec 2023 11:55:46 GMT

TABLE statement is for your raw data like you post.
VAR statement is for NxM contingency table (like PROC FREQ), you need change your raw data into NxM table .

So your code looks right. Could you post your LOG to see where is not working ?

Re: proc corresp

WarrenKuhfeld — Tue, 12 Dec 2023 11:08:32 GMT

@Ksharp Sorry, but it is the other way around.

Re: proc corresp

Ksharp — Tue, 12 Dec 2023 11:59:03 GMT

Warren,
Sorry. My bad. my brain must run into some problem .
TABLE is for raw data, VAR is for mxn table just like PROC FREQ .

Re: proc corresp

Ameurgen — Tue, 12 Dec 2023 14:22:45 GMT

Thank all for your help is appreciated.

regards