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VBA/CosineSimilarity.bas

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+Attribute VB_Name = "Module4"
+Function SimilarityCosine(s1 As String, s2 As String) As Double
+    Dim words1 As Object
+    Set words1 = CreateObject("Scripting.Dictionary")
+    
+    Dim words2 As Object
+    Set words2 = CreateObject("Scripting.Dictionary")
+    
+    Dim i As Integer
+    Dim j As Integer
+    Dim dotProduct As Double
+    Dim magnitude1 As Double
+    Dim magnitude2 As Double
+    
+    ' Split the strings into words and create vectors
+    Dim words As Variant
+    words = Split(s1 & " " & s2, " ")
+    
+    For i = LBound(words) To UBound(words)
+        If Trim(words(i)) <> "" Then
+            words1(Trim(words(i))) = 0
+            words2(Trim(words(i))) = 0
+        End If
+    Next i
+    
+    ' Populate the vectors
+    For i = LBound(words) To UBound(words)
+        If Trim(words(i)) <> "" Then
+            If i <= UBound(Split(s1, " ")) Then
+                words1(Trim(words(i))) = words1(Trim(words(i))) + 1
+            Else
+                words2(Trim(words(i))) = words2(Trim(words(i))) + 1
+            End If
+        End If
+    Next i
+    
+    ' Calculate dot product and magnitudes
+    For Each Key In words1.Keys
+        dotProduct = dotProduct + (words1(Key) * words2(Key))
+        magnitude1 = magnitude1 + (words1(Key) * words1(Key))
+        magnitude2 = magnitude2 + (words2(Key) * words2(Key))
+    Next Key
+    
+    ' Calculate cosine similarity
+    If magnitude1 * magnitude2 = 0 Then
+        SimilarityCosine = 0
+    Else
+        SimilarityCosine = dotProduct / (Sqr(magnitude1) * Sqr(magnitude2))
+    End If
+End Function

VBA/JaroWinklerSimilarity.bas

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+Attribute VB_Name = "Module2"
+Function SimilarityJaroWinkler(s1 As String, s2 As String) As Double
+    Dim m As Integer ' Number of matching characters
+    Dim t As Integer ' Number of transpositions
+    Dim l1 As Integer ' Length of string 1
+    Dim l2 As Integer ' Length of string 2
+    Dim maxLen As Integer
+    Dim prefix As Integer
+    Dim jw As Double ' Jaro-Winkler similarity
+
+    l1 = Len(s1)
+    l2 = Len(s2)
+    maxLen = IIf(l1 > l2, l1, l2)
+
+    ' Calculate the number of matching characters
+    m = 0
+    t = 0
+    For i = 1 To l1
+        For j = IIf(i - 2 > 0, i - 2, 1) To IIf(i + 2 <= l2, i + 2, l2)
+            If Mid(s1, i, 1) = Mid(s2, j, 1) Then
+                m = m + 1
+                If i <> j Then t = t + 1
+                Exit For
+            End If
+        Next j
+    Next i
+
+    ' Calculate the prefix length
+    prefix = 0
+    For i = 1 To IIf(l1 > 4, 4, l1)
+        If Mid(s1, i, 1) = Mid(s2, i, 1) Then
+            prefix = prefix + 1
+        Else
+            Exit For
+        End If
+    Next i
+
+    ' Calculate the Jaro similarity
+    If m = 0 Then
+        jw = 0
+    Else
+        jw = (m / l1 + m / l2 + (m - t) / m) / 3
+        jw = jw + (prefix * 0.1 * (1 - jw))
+    End If
+
+    SimilarityJaroWinkler = jw
+End Function

VBA/LevenshteinSimilarity.bas

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+Attribute VB_Name = "Module1"
+Function SimilarityLevenshtein(target As String, reference As String) As Double
+    Dim maxLen As Long
+    Dim minLen As Long
+    Dim distance As Double
+    Dim similarity As Double
+
+    ' Remove spaces and convert to lowercase
+    target = Replace(LCase(target), " ", "")
+    reference = Replace(LCase(reference), " ", "")
+
+    maxLen = IIf(Len(target) > Len(reference), Len(target), Len(reference))
+    minLen = IIf(Len(target) < Len(reference), Len(target), Len(reference))
+
+    distance = maxLen - minLen
+    For i = 1 To minLen
+        If Mid(target, i, 1) <> Mid(reference, i, 1) Then
+            distance = distance + 1
+        End If
+    Next i
+
+    similarity = (1 - distance / maxLen)
+    SimilarityLevenshtein = similarity
+End Function
+

VBA/NGramJaccardSimilarity.bas

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+Attribute VB_Name = "Module5"
+Function SimilarityNGramJaccard(s1 As String, s2 As String, n As Integer) As Double
+    Dim set1 As Object
+    Set set1 = CreateObject("Scripting.Dictionary")
+    
+    Dim set2 As Object
+    Set set2 = CreateObject("Scripting.Dictionary")
+    
+    Dim i As Integer
+    Dim ngram1 As String
+    Dim ngram2 As String
+    
+    ' Create n-grams from string 1
+    For i = 1 To Len(s1) - n + 1
+        ngram1 = Mid(s1, i, n)
+        set1(ngram1) = 1
+    Next i
+    
+    ' Create n-grams from string 2
+    For i = 1 To Len(s2) - n + 1
+        ngram2 = Mid(s2, i, n)
+        set2(ngram2) = 1
+    Next i
+    
+    ' Calculate the size of the intersection of the n-gram sets
+    Dim intersectionSize As Integer
+    intersectionSize = 0
+    
+    For Each Key In set1.Keys
+        If set2.Exists(Key) Then
+            intersectionSize = intersectionSize + 1
+        End If
+    Next Key
+    
+    ' Calculate the n-gram similarity
+    Dim similarity As Double
+    
+    If set1.Count + set2.Count = 0 Then
+        similarity = 1
+    Else
+        similarity = intersectionSize / (set1.Count + set2.Count - intersectionSize)
+    End If
+    
+    SimilarityNGramJaccard = similarity
+End Function

VBA/SorensenDiceSimilarity.bas

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+Attribute VB_Name = "Module3"
+Function SimilaritySorensenDiceCoef(s1 As String, s2 As String) As Double
+    Dim set1 As Object
+    Set set1 = CreateObject("Scripting.Dictionary")
+    
+    Dim set2 As Object
+    Set set2 = CreateObject("Scripting.Dictionary")
+    
+    Dim i As Integer
+    
+    ' Create sets of characters from both strings
+    For i = 1 To Len(s1)
+        set1(Mid(s1, i, 1)) = 1
+    Next i
+    
+    For i = 1 To Len(s2)
+        set2(Mid(s2, i, 1)) = 1
+    Next i
+    
+    ' Calculate the size of the intersection of the sets
+    Dim intersectionSize As Integer
+    intersectionSize = 0
+    
+    For Each Key In set1.Keys
+        If set2.Exists(Key) Then
+            intersectionSize = intersectionSize + 1
+        End If
+    Next Key
+    
+    ' Calculate the S<>rensen-Dice coefficient
+    Dim coefficient As Double
+    
+    If set1.Count + set2.Count = 0 Then
+        coefficient = 1
+    Else
+        coefficient = 2 * intersectionSize / (set1.Count + set2.Count)
+    End If
+    
+    SimilaritySorensenDiceCoef = coefficient
+End Function