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Usually determined by what the point of the graph is. If you are showing interest rates over last 10 years, 1 year may be a good interval. However if you just want to show a general rise over the 10 years, you may just have the two edge numbers and no intermediate values.

Similarly horizontal values. Eg if you are showing house prices change for a house bought for 245,000 in 1990, you may just show the value 245,000 as the prices rise and fall.

In general show the minimum bars needed to make your point.

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14y ago

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