A data frame containing 117 observations for the following variables.
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month month (coded as a number)
	 
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day day of month on which bill was calculated
	 
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year year of bill
	 
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temp average temperature (F) for billing period
	 
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kwh electricity usage (kwh)
	 
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ccf gas usage (ccf)
	 
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thermsPerDay a numeric vector
	 
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billingDays number of billing days in billing period
	 
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totalbill total bill (in dollars)
	 
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gasbill gas bill (in dollars)
	 
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elecbill electric bill (in dollars)
	 
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notes notes about the billing period
	 
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ccfpday average gas usage per day (Utilities2 only)
	 
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kwhpday average electric usage per day (Utilities2 only)
	 
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gasbillpday gas bill divided by billing days (Utilities2 only)
	 
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elecbillpday electric bill divided by billing days a numeric vector (Utilities2 only)
	 
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totalbillpday total bill divided by billing days a numeric vector (Utilities2 only)
	 
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therms thermsPerDay * billingDays (Utilities2 only)
	 
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monthsSinceY2K months since 2000 (Utilities2 only)