feat(checker): add statistical ops on frames

midas/checker/frames/frame_methods.py

@@ -227,8 +227,7 @@ class FrameMethodRegistry(MethodRegistry[Call]):
     def eq(self, call: Call) -> Type:
         return self._element_wise(call, "__eq__")
 
-    @method()
-    def mean(self, call: Call) -> Type:
+    def _statistical(self, call: Call, kwargs: list[Function.Argument] = []) -> Type:
         with_axis = Function(
             kw_args=[
                 Function.Argument(
@@ -236,7 +235,8 @@ class FrameMethodRegistry(MethodRegistry[Call]):
                     name="axis",
                     type=self.types.get_type("int"),
                     required=False,
-                )
+                ),
+                *kwargs,
             ],
             returns=ColumnType(type=TopType()),
         )
@@ -247,7 +247,8 @@ class FrameMethodRegistry(MethodRegistry[Call]):
                     name="axis",
                     type=self.types.get_type("None"),
                     required=True,
-                )
+                ),
+                *kwargs,
             ],
             returns=TopType(),
         )
@@ -266,6 +267,66 @@ class FrameMethodRegistry(MethodRegistry[Call]):
         )
         return result.result
 
+    @method("kurtosis", "kurt")
+    def kurtosis(self, call: Call) -> Type:
+        return self._statistical(call)
+
+    @method()
+    def max(self, call: Call) -> Type:
+        return self._statistical(call)
+
+    @method()
+    def mean(self, call: Call) -> Type:
+        return self._statistical(call)
+
+    @method()
+    def median(self, call: Call) -> Type:
+        return self._statistical(call)
+
+    @method()
+    def min(self, call: Call) -> Type:
+        return self._statistical(call)
+
+    @method()
+    def mode(self, call: Call) -> Type:
+        return self._statistical(call)
+
+    @method("product", "prod")
+    def product(self, call: Call) -> Type:
+        return self._statistical(call)
+
+    @method()
+    def std(self, call: Call) -> Type:
+        return self._statistical(
+            call,
+            [
+                Function.Argument(
+                    pos=1,
+                    name="ddof",
+                    type=self.types.get_type("int"),
+                    required=False,
+                )
+            ],
+        )
+
+    @method()
+    def sum(self, call: Call) -> Type:
+        return self._statistical(call)
+
+    @method()
+    def var(self, call: Call) -> Type:
+        return self._statistical(
+            call,
+            [
+                Function.Argument(
+                    pos=1,
+                    name="var",
+                    type=self.types.get_type("int"),
+                    required=False,
+                )
+            ],
+        )
+
     @method()
     def groupby(self, call: Call) -> Type:
         bool_: Type = self.types.get_type("bool")

tests/cases/checker/09_frame_ops.py

@@ -5,6 +5,8 @@ df1: Frame[a:int, b:float]
 df2: Frame[a:int, b:float]
 
 _: Any
+
+# Arithmetic
 _ = df1 + df2
 _ = df1 - df2
 _ = df1 * df2
@@ -13,9 +15,24 @@ _ = df1 // df2
 _ = df1 % df2
 _ = df1**df2
 
+# Comparisons
 _ = df1 < df2
 _ = df1 > df2
 _ = df1 <= df2
 _ = df1 >= df2
 _ = df1 != df2
 _ = df1 == df2
+
+# Statistical
+_ = df1.kurt()
+_ = df1.kurtosis()
+_ = df1.max()
+_ = df1.mean()
+_ = df1.median()
+_ = df1.min()
+_ = df1.mode()
+_ = df1.prod()
+_ = df1.product()
+_ = df1.std()
+_ = df1.sum()
+_ = df1.var()