Re: SPC-XL Alternative?

From: Jerry W. Lewis (post_a_reply_at_no_e-mail.com)
Date: 10/14/04 

Date: Thu, 14 Oct 2004 11:43:15 GMT

Do not assume that distribution functions in SPC-XL are better than in
Excel, just because this is a commercial add-in.

Benchmarking distribution calculations in SPC-XL is difficult because of
an interface that only permits one calculation at a time and requires
you to write down the (less than full precision) displayed result,
rather than having a cell that you can reference or copy/paste. I have
only looked at the Chi-Squared distribution in SPC-XL, but the inverse
appears to used Excel's CHIINV function. The distribution calculation
may round the supplied x value before calculating with CHIDIST, or it
may use an independent calculation; but the results, while different
than Excel's CHIDIST function, are not particularly more accurate than
CHIDIST.

A more accurate implementation of distribution functions, with a more
flexible interface is Ian Smith's VBA library of probability functions
    http://members.aol.com/iandjmsmith/examples.xls

Jerry

A P wrote:

> One of my client is using SPC-XL demo version for his MS Excel 2000. Its a
> demo version that expires every 15 days. We are planning to purchasing one
> license but before we do that, is there a free software add-in for this
> feature? Here is the complete overview of the product:
> http://www.sigmazone.com/spcxl_features.htm or see list of quality features
> if you cant access the web:
>
> Control Charts
> Analysis Diagrams
> Analysis Tools
> Access to 15 Continuous and 6 Discrete Distributions
> Generation of Random Numbers
> MSA (Measurement System Analysis) or gage capability
> Problem Identification Tools
> Quality Tools
>
>
> As I see the price, it cost around $199 dollars for just an Excel Add-in. If
> you can send me some links that my client will use an alternative for SPC
> XL.
>
>
> Me

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