NIT: Fatty acids study in R - Part 004

We already know that sample 66 has a MD of 11.6. Let´s see the values for the six constituents for this sample:

> fattyac_msc[66,1:6]

   C16_0  C16_1  C18_0  C18_1  C18_2  C18_3

66  15.8     2     6    62.3   10.2    0.6

Let´s compare with the summary

> summary(fattyac_msc)

        C16_0           C16_1                 

 Min.   : 0.00   Min.   :1.500     

 1st Qu.:20.10   1st Qu.:2.000     

 Median :21.00   Median :2.200     

 Mean   :21.34   Mean   :2.267     

 3rd Qu.:22.90   3rd Qu.:2.500     

 Max.   :26.00   Max.   :3.500    

   

  C18_0            C18_1     

Min.   : 5.800   Min.   :43.80 

1st Qu.: 8.600   1st Qu.:51.95 

Median : 9.400   Median :54.50 

Mean   : 9.711   Mean   :53.93 

3rd Qu.:10.500   3rd Qu.:56.15 

Max.   :14.000   Max.   :62.30 

 C18_2            C18_3      

 Min.   : 5.500   Min.   :0.3000 

 1st Qu.: 7.600   1st Qu.:0.5000 

 Median : 8.500   Median :0.6000 

 Mean   : 8.503   Mean   :0.6032 

 3rd Qu.: 9.100   3rd Qu.:0.7000 

 Max.   :14.700   Max.   :1.3000  

Sample 66 has the higher value for C18:1 (oleic acid), but it is not isolated in the histogram. For some reasons this sample differs from the others especially from 100 to 1050 nm. We will wait forward to take a decision about this sample.
Until now we have been managing with the X matrix.
Now we start to study the Y matrix. First thing to do is to have a look to the summary, and of course to the histograms.
If you want to follow this tutorial, please send me an e_mail. I´ll send you the “txt” file attached.

> hist(C16_0,col="red")

> hist(C16_1,col="blue")

> hist(C18_0,col="green")

> hist(C18_1,col="brown")

> hist(C18_2,col="violet")

> hist(C18_3,col="orange")