When you are showing a change over time, use a time series (a line chart with time on the columns shelf)
Actual Sales is a measure.
What is Dimension & measure?
Dimension: A dimension is a field that can be considered an independent variable.
Dimensions typically produce headers when added to the rows or columns shelves in the view. By default, Tableau treats any field containing qualitative, categorical information as a dimension. This includes, for instance, any field with text or dates values.
This means that a measure can be aggregated for each value of the dimension. For instance, you might calculate the Sum of Sales for every State. In this case the State field is acting as a dimension because you want to aggregate sales for each state. The values of Sales are dependent on the State, so State is an independent field and Sales is a dependent field.
Measure:A measure is a field that is a dependent variable; that is, its value is a function of one or more dimensions.
Measures typically produce axes when added to the rows or columns shelves. By default, Tableau treats any field containing numeric (quantitative) information as a measure.
This means that a measure is a function of other dimensions placed on the worksheet. For instance, you might calculate the Sum of Sales for every State. In this case, the Sales field is acting as a measure because you want to aggregate the field for each state. But measures could also result in a non-numeric result. For instance, you might create a calculated measure called Sales Rating that results in the word Good if sales are good and Bad otherwise. In this case the Sales Rating field acts as a measure even though it produces a non-numeric result. It is considered a measure because it is a function of the dimensions in the view.
Can you explain little briefly..MAM
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