> library(arules)

> data(Groceries)

> inspect(Groceries)

9834 {semi-finished bread,     
      bottled water,           
      soda,                    
      bottled beer}            
9835 {chicken,                 
      tropical fruit,          
      other vegetables,        
      vinegar,                 
      shopping bags}           
> rules=apriori(Groceries,parameter=list(support=0.01,confidence=0.5))

parameter specification:
 confidence minval smax arem  aval originalSupport support minlen maxlen target   ext
        0.5    0.1    1 none FALSE            TRUE    0.01      1     10  rules FALSE

algorithmic control:
 filter tree heap memopt load sort verbose
    0.1 TRUE TRUE  FALSE TRUE    2    TRUE

apriori - find association rules with the apriori algorithm
version 4.21 (2004.05.09)        (c) 1996-2004   Christian Borgelt
set item appearances ...[0 item(s)] done [0.00s].
set transactions ...[169 item(s), 9835 transaction(s)] done [0.00s].
sorting and recoding items ... [88 item(s)] done [0.00s].
creating transaction tree ... done [0.00s].
checking subsets of size 1 2 3 4 done [0.00s].
writing ... [15 rule(s)] done [0.00s].
creating S4 object  ... done [0.02s].
> summary(rules)
set of 15 rules

rule length distribution (lhs + rhs):sizes
 3
15

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

summary of quality measures:
    support          confidence          lift     
 Min.   :0.01007   Min.   :0.5000   Min.   :1.984 
 1st Qu.:0.01174   1st Qu.:0.5151   1st Qu.:2.036 
 Median :0.01230   Median :0.5245   Median :2.203 
 Mean   :0.01316   Mean   :0.5411   Mean   :2.299 
 3rd Qu.:0.01403   3rd Qu.:0.5718   3rd Qu.:2.432 
 Max.   :0.02227   Max.   :0.5862   Max.   :3.030 

mining info:
      data ntransactions support confidence
 Groceries          9835    0.01        0.5
> inspect(rules)
   lhs                     rhs                   support confidence     lift
1  {curd,                                                                  
    yogurt}             => {whole milk}       0.01006609  0.5823529 2.279125
2  {other vegetables,                                                      
    butter}             => {whole milk}       0.01148958  0.5736041 2.244885
3  {other vegetables,                                                      
    domestic eggs}      => {whole milk}       0.01230300  0.5525114 2.162336
4  {yogurt,                                                                
    whipped/sour cream} => {whole milk}       0.01087951  0.5245098 2.052747
5  {other vegetables,                                                      
    whipped/sour cream} => {whole milk}       0.01464159  0.5070423 1.984385
6  {pip fruit,                                                             
    other vegetables}   => {whole milk}       0.01352313  0.5175097 2.025351
7  {citrus fruit,                                                          
    root vegetables}    => {other vegetables} 0.01037112  0.5862069 3.029608
8  {tropical fruit,                                                        
    root vegetables}    => {other vegetables} 0.01230300  0.5845411 3.020999
9  {tropical fruit,                                                        
    root vegetables}    => {whole milk}       0.01199797  0.5700483 2.230969
10 {tropical fruit,                                                        
    yogurt}             => {whole milk}       0.01514997  0.5173611 2.024770
11 {root vegetables,                                                       
    yogurt}             => {other vegetables} 0.01291307  0.5000000 2.584078
12 {root vegetables,                                                       
    yogurt}             => {whole milk}       0.01453991  0.5629921 2.203354
13 {root vegetables,                                                       
    rolls/buns}         => {other vegetables} 0.01220132  0.5020921 2.594890
14 {root vegetables,                                                       
    rolls/buns}         => {whole milk}       0.01270971  0.5230126 2.046888
15 {other vegetables,                                                      
    yogurt}             => {whole milk}       0.02226741  0.5128806 2.007235
> x=subset(rules,subset=rhs%in%"whole milk"&lift>=1.2)
> x
set of 11 rules
> inspect(x)
   lhs                     rhs             support confidence     lift
1  {curd,                                                            
    yogurt}             => {whole milk} 0.01006609  0.5823529 2.279125
2  {other vegetables,                                                
    butter}             => {whole milk} 0.01148958  0.5736041 2.244885
3  {other vegetables,                                                
    domestic eggs}      => {whole milk} 0.01230300  0.5525114 2.162336
4  {yogurt,                                                          
    whipped/sour cream} => {whole milk} 0.01087951  0.5245098 2.052747
5  {other vegetables,                                                
    whipped/sour cream} => {whole milk} 0.01464159  0.5070423 1.984385
6  {pip fruit,                                                       
    other vegetables}   => {whole milk} 0.01352313  0.5175097 2.025351
7  {tropical fruit,                                                  
    root vegetables}    => {whole milk} 0.01199797  0.5700483 2.230969
8  {tropical fruit,                                                  
    yogurt}             => {whole milk} 0.01514997  0.5173611 2.024770
9  {root vegetables,                                                 
    yogurt}             => {whole milk} 0.01453991  0.5629921 2.203354
10 {root vegetables,                                                 
    rolls/buns}         => {whole milk} 0.01270971  0.5230126 2.046888
11 {other vegetables,                                                
    yogurt}             => {whole milk} 0.02226741  0.5128806 2.007235
> inspect(sort(x,by="support")[1:5])
  lhs                     rhs             support confidence     lift
1 {other vegetables,                                                
   yogurt}             => {whole milk} 0.02226741  0.5128806 2.007235
2 {tropical fruit,                                                  
   yogurt}             => {whole milk} 0.01514997  0.5173611 2.024770
3 {other vegetables,                                                
   whipped/sour cream} => {whole milk} 0.01464159  0.5070423 1.984385
4 {root vegetables,                                                 
   yogurt}             => {whole milk} 0.01453991  0.5629921 2.203354
5 {pip fruit,                                                       
   other vegetables}   => {whole milk} 0.01352313  0.5175097 2.025351
> inspect(sort(x,by="support")[1:11])
   lhs                     rhs             support confidence     lift
1  {other vegetables,                                                
    yogurt}             => {whole milk} 0.02226741  0.5128806 2.007235
2  {tropical fruit,                                                  
    yogurt}             => {whole milk} 0.01514997  0.5173611 2.024770
3  {other vegetables,                                                
    whipped/sour cream} => {whole milk} 0.01464159  0.5070423 1.984385
4  {root vegetables,                                                 
    yogurt}             => {whole milk} 0.01453991  0.5629921 2.203354
5  {pip fruit,                                                       
    other vegetables}   => {whole milk} 0.01352313  0.5175097 2.025351
6  {root vegetables,                                                 
    rolls/buns}         => {whole milk} 0.01270971  0.5230126 2.046888
7  {other vegetables,                                                
    domestic eggs}      => {whole milk} 0.01230300  0.5525114 2.162336
8  {tropical fruit,                                                  
    root vegetables}    => {whole milk} 0.01199797  0.5700483 2.230969
9  {other vegetables,                                                
    butter}             => {whole milk} 0.01148958  0.5736041 2.244885
10 {yogurt,                                                          
    whipped/sour cream} => {whole milk} 0.01087951  0.5245098 2.052747
11 {curd,                                                            
    yogurt}             => {whole milk} 0.01006609  0.5823529 2.279125