The data:

##       vote           pbldmn         stflife          imbgeco      
##  Min.   :1.000   Min.   :1.000   Min.   : 0.000   Min.   : 0.000  
##  1st Qu.:1.000   1st Qu.:2.000   1st Qu.: 7.000   1st Qu.: 4.000  
##  Median :1.000   Median :2.000   Median : 8.000   Median : 5.000  
##  Mean   :1.322   Mean   :1.969   Mean   : 7.602   Mean   : 4.868  
##  3rd Qu.:2.000   3rd Qu.:2.000   3rd Qu.: 8.000   3rd Qu.: 6.000  
##  Max.   :3.000   Max.   :2.000   Max.   :10.000   Max.   :10.000  
##  NA's   :2       NA's   :2       NA's   :1        NA's   :42      
##      rlgblg          rlgdgr           gndr            agea      
##  Min.   :1.000   Min.   : 0.00   Min.   :1.000   Min.   :14.00  
##  1st Qu.:1.000   1st Qu.: 1.00   1st Qu.:1.000   1st Qu.:36.00  
##  Median :2.000   Median : 5.00   Median :2.000   Median :52.00  
##  Mean   :1.625   Mean   : 4.25   Mean   :1.552   Mean   :50.74  
##  3rd Qu.:2.000   3rd Qu.: 7.00   3rd Qu.:2.000   3rd Qu.:65.00  
##  Max.   :2.000   Max.   :10.00   Max.   :2.000   Max.   :95.00  
##  NA's   :2       NA's   :4                       NA's   :3      
##     dvrcdeva         marsts         pdjobev         wrkctra     
##  Min.   :1.000   Min.   :1.000   Min.   :1.000   Min.   :1.000  
##  1st Qu.:2.000   1st Qu.:4.000   1st Qu.:1.000   1st Qu.:1.000  
##  Median :2.000   Median :6.000   Median :1.000   Median :1.000  
##  Mean   :1.814   Mean   :5.116   Mean   :1.101   Mean   :1.334  
##  3rd Qu.:2.000   3rd Qu.:6.000   3rd Qu.:1.000   3rd Qu.:2.000  
##  Max.   :2.000   Max.   :6.000   Max.   :2.000   Max.   :3.000  
##                  NA's   :940     NA's   :1015    NA's   :324

immigration

##    Min. 1st Qu.  Median    Mean 3rd Qu.    Max.    NA's 
##   0.000   4.000   5.000   4.868   6.000  10.000      42

-> according to the histogram and the summary i may say that the variable is distributed normally

work contracts

##        0 - no_c   1 - limited_c 2 - unlimited_c            NA's 
##             131             271            1193             324

levene test

anova

## 
##  One-way analysis of means
## 
## data:  data$imbgeco and data$wrkctra
## F = 5.3542, num df = 2, denom df = 1565, p-value = 0.004815
##                Df Sum Sq Mean Sq F value  Pr(>F)   
## data$wrkctra    2     41   20.66   5.354 0.00482 **
## Residuals    1565   6040    3.86                   
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 351 observations deleted due to missingness

p-value is small - anova is significant. Let’s check it closer. Accorsing to the TukeyHSD test significance difference is between :

  • groups with limited contract and no contract;
  • groups with unlimited contract and no contract;

##   Tukey multiple comparisons of means
##     95% family-wise confidence level
## 
## Fit: aov(formula = data$imbgeco ~ data$wrkctra)
## 
## $`data$wrkctra`
##                                     diff          lwr       upr     p adj
## 1 - limited_c-0 - no_c        0.49801691  0.002106044 0.9939278 0.0487561
## 2 - unlimited_c-0 - no_c      0.59783347  0.167258127 1.0284088 0.0032935
## 2 - unlimited_c-1 - limited_c 0.09981655 -0.211329127 0.4109622 0.7321062

To sum up this part I would say that group with no contract differs a lot from those with contract and people from this group give lower grade to the point if immigration from the country is good or bad to its economy.