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Friday, December 16, 2011

How to Use the Microsoft Excel NORMSINV Function

Microsoft Excel is an electronic worksheet application wherein you can store, organize, and manipulate data. Excel has columns and rows which are labeled as numbers and letters.
To make your calculation easier with Excel you can use the Excel Functions. These functions include Math Functions, Database Functions, Engineering Functions, Statistical Functions and many others. Statistical Functions allow you to do common and complex computations starting with mean, median and mode to probability tests. However, some of the functions are not pre-installed in the older versions of Excel.
The Statistical Function is divided into sub-groups to easily find the function and formula you want to use. A sub-group of the Statistical Function is the Distribution and Test of Probability includes the NORMSINV function.
The NORMSINV function allows you to compute the inverse of the Standard Normal Cumulative Distribution Function for a given value of the probability. In this distribution, the standard mean is zero and the value of the standard deviation is one. The syntax of the NORMSINV function is =NORMSINV(probability). The probability argument refers to the probability in the normal distribution.
There are two common errors that occur while using the NORMSINV function and these are the #VALUE! Error and the #NUM! Error. If the given values in the probability are non-numerical values then the #NUM! Error will occur. Likewise, if the probability value are lesser than zero or more than one then the #NUM! error will occur.
Open a blank Excel worksheet or spreadsheet and input the formula on cell A1 =NORMSINV (0.908789) and the result will be 1.3333. The result is the probability of an inverse standard normal cumulative distribution. Another sample formula is =NORMSINV (0.25) and the result will be 0.67448975.
The NORMSINV function finds the z value in the probability such as the NORMSDIST (z). The precise value of the NORMSDIST depends greatly on the NORMSINV. Moreover, the NORMSINV use the iterative technique to search and if the coverage of the search did not reach 100 iterations the error #N/A will occur.
In using the NORMSINV functions the #NUM! error and the #VALUE! error will usually occur. The #NUM! error will occur if the given probability in the formula is less than or equal to zero and if the value is also greater than or equal to 1. The #VALUE! error will occur if the given probability in the formula is non-numeric.
Moreover, you can view from results to formulas and results to formulas by selecting the cell and hit the Ctrl+` (grave accent) keys. Also, you can do this by hitting the Formulas tab and select the Formula Auditing group and select the Show Formula options.

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