Update README.md

README.md

@@ -51,6 +51,61 @@ echo "Mode              : " . $stat->getMode() . PHP_EOL;
 // Mode              : 5
 ```
 
+### Calculate Frequencies Table
+
+Statistics packages has some methods for generating Frequencies Table:
+- getFrequencies(): a frequency is the number of times a value of the data occurs;
+- getRelativeFrequencies(): a relative frequency is the ratio (fraction or proportion) of the number of times a value of the data occurs in the set of all outcomes to the total number of outcomes;
+- getCumulativeFrequences(): is the accumulation of the previous relative frequencies.;
+- getCumulativeRelativeFrequencies(): is the accumulation of the previous relative ratio.
+
+
+
+```php
+use HiFolks\Statistics\Statistics;
+
+$s = Statistics::make(
+    [98, 90, 70,18,92,92,55,83,45,95,88,76]
+);
+$a = $s->getFrequencies();
+print_r($a);
+/*
+Array
+(
+    [18] => 1
+    [45] => 1
+    [55] => 1
+    [70] => 1
+    [76] => 1
+    [83] => 1
+    [88] => 1
+    [90] => 1
+    [92] => 2
+    [95] => 1
+    [98] => 1
+)
+ */
+
+$a = $s->getRelativeFrequencies();
+print_r($a);
+/*
+Array
+(
+    [18] => 8.3333333333333
+    [45] => 8.3333333333333
+    [55] => 8.3333333333333
+    [70] => 8.3333333333333
+    [76] => 8.3333333333333
+    [83] => 8.3333333333333
+    [88] => 8.3333333333333
+    [90] => 8.3333333333333
+    [92] => 16.666666666667
+    [95] => 8.3333333333333
+    [98] => 8.3333333333333
+)
+ */
+
+```
 ## Testing
 
 ```bash