Substitute for sour cream

Substitute one of the following for each 1 cup of sour cream:

1. For baking: 7/8 cup buttermilk or sour milk plus 3 tablespoons butter.
2. For baking: 1 cup yogurt plus 1 teaspoon baking soda.
3. For baking: 3/4 cup sour milk plus 1/3 cup butter.
4. For baking: 3/4 cup buttermilk plus 1/3 cup butter.                 For my other blogs, I'm giving the links below, feel free to view and comment too.   
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