Summary Function

 The summary function is important to review the data limits of your data. In R, it is very simple you can view the summary of all your parameters and of single parameters by following codes:

# Import your data file

setwd("D:/R_working/script_book")

data_soil=read.csv("data_soil.csv",na="***")

data_soil=data.frame(data_soil)

# Summary of all  data

summary(data_soil)

## water_contents soil_phosphorus     soil_potassium     electrical_conductivity

## Min. :28.10         Min. :8.460         Min. :184.0             Min. :1.900

## 1st Qu.:31.16     1st Qu.:8.540         1st Qu.:189.0         1st Qu.:2.170

## Median :33.01     Median :8.595     Median :193.0         Median :2.300

## Mean :35.89         Mean :8.710         Mean :193.3         Mean :2.326

## 3rd Qu.:39.42     3rd Qu.:8.775         3rd Qu.:196.2         3rd Qu.:2.440

## Max. :54.10         Max. :9.540             Max. :210.0         Max. :3.210

  Sumamry of singel paramters can be viewed by following codes:

summary(data_soil$Organic_matter)

## Min.         1st Qu.     Median     Mean     3rd Qu.     Max.

## 0.3900     0.4700     0.5300     0.5394     0.5825     0.7900