Instructions:
Select a radio button then enter the appropriate values in the textboxes that remain
active. Then click the "Well?" button.
If you selected the "How confident am I?"
radio button, the response will be the confidence level given the number of hands you have played.
If you selected the "How many hands?" radio button, the response will be the number of hands
required to achieve the confidence level you specified.
Notes:
- IMPORTANT: Units must be consistent. For instance, if you enter a winrate in
BB/100 hands, then the standard deviation must have units of BB/100 hands and
the number of hands must be in 100's of hands (e.g., if you have actually played
20,000 hands, then enter 200 for the number of hands.)
- Winrate may be a positive or negative number.
- Standard Deviation must be a number greater than zero.
- Number of Hands must be a number greater than zero.
- Confidence must be a number (representing a percentage) greater than zero and less than 100.
- Output for number of hands is displayed to the nearest integer value while
confidence values are displayed to two decimal places.
Math: this program uses the following equations
c= Φ(un1/2/σ)
n= [(σ/u)Φ-1(c)]2
Where c is confidence level, Φ() is the standard cumulative normal
distribution funcion, u is winrate, n is number of hands,
σ is standard deviation, and
Φ-1() is the inverse standard cumulative
normal distribution function.
For the case where u<0, n is simply reported as NA.
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