I will appreciate if you could explain how I can create a carpet plot with two independent variables and one dependent variable using excel? Thanks.
Version of Excel: 2010
Strictly speaking there is no carpet plot capability in Excel. However, there is contour plot capability which I suspect is what you actually have in mind. An example of a contour plot would be a map with lines or colors indicating different terrain elevation levels.
To do a contour plot you need to have your data in table form, with the x-axis grid values along the top row of the table and the y-axis grid values beside the leftmost column of the table. An example would be for the map I mentioned where the top row would be latitude values, the first column would be latitude values, and the interior of the table would be elevation values.
Once you have the data in this form, select the table (including grid values) and then use Insert > Chart to create your chart. At this point you will have the option to select the chart type. Select Contour (next to the 3-D surface type).
Unfortunately the Excel capability to do contour plots is neither very powerful nor user-friendly, with with a bit of work (and usually some trial-and-error) you can usually get approximately what you want. I have found I generally have to edit the names of the data series' (usually the table row data) to get the names consistent with the actual data values. In addition you will generally need to edit the z-axis increment to get the contours to have the intervals you want because Excel does not seem to choose the increment very intelligently. The easiest way to do this is to change the chart from a Contour chart type to a 3-D chart type. Then you can select the z-axis (which represents the table values) and set its max, min, and increment values. Then you can change the chart back to a Contour chart type. Sometimes it is actually easier to set it up originally as a 3-D Surface chart type and when you get everything set up (axes increments and labeling, etc.) then you can switch it to a Contour type.
I hope you find this helpful.
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