Data Set Control
Manipulate Data
Coming Soon
New
Write or paste data in the following form for each line:
The first three characters are the persons identifier (ie 001)
Any numbers following that are the scores for each item. A '1' is a correct answer, a '0' is incorrect.
Load
Generate Random Data
Leave blank for true randomness
Equations Used
| Z Score | BiSerial | Point Biserial | Y (Ordinate) |
μ+ - μTotal
σ | ((μ+ - μTotal)/σ)*P/Y | ((μ+ - μTotal)/σ)*√(P/q) | e-(μ+ - μTotal)2/(2σ2)
√(2πσ2) |
| Cronbachs Alpha | | | |
| (1 - (∑σ2 / σ2)) * (K / K - 1) | | | |
Global Values
| μTotal (Mean) | Min | Max | σ (Std Deviation) | σ2 (Variance) | K (No. Items) | N (Sample Size) |
| | | 0 | 0 | | 0 |
Per Item Calculations Click a row for details
| Item No. | μ+ | P Value | Z Score | Point Biserial | Std. Deviation | Variance |
Reliabilites Click for details
| KR20 | Cronbach's Alpha | Std. Error |
| 0 | 0 |
0 |
| KR20 = ( / ( - 1)) * (1 - 0/0) | Alpha = (1 - ( / 0))*( / - 1) | Std Error = |
CoVariances Coming Soon
Spearman-Brown Prophecy