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## Statistical functions
You can change to ## Data entryThe usual way to enter data is with the Σ+ button (key ‘M’). This button evaluates the current expression, stores the result and returns a number showing the total number of data values now stored. So, for example to store the data 5, 6, 7 do the following. 5 Σ+ (result 1); 6 Σ+ (result 2); 7 Σ+ (result 3). The statistical memory will now contain the three numbers 5, 6 and 7. If you ever want to remove a data value, you can use the Σ− button (keys shift ‘M’). This has the effect of evaluating the current expression, removing the value from statistical memory and decreaseing the number of data values stored. ## Emptying the statistical memoryUse the Scl button (keys shift ‘\’) to clear the statistical memory of data. It is a good idea to do this before entering a new set of data, just in case you left in some old values. ## Mean and standard deviationThe calculator provides one mean and two standard deviation functions, one for population standard deviation, one for sample standard deviation.
The mean button (
The σ
The σ ## What about other statistical functions?The calculator limits yout to the three statistical functions found on most calculators and deliberately emulates how these work. It may some day allow you to see the data or provide some other functions. However, regression and correlation functions are unlikely. For anything more than a small data sample, a calculator is not a good way to do statistics. A statistical package like R is better. Last modified: Sat 31 May 2008 01:11 pm |