## GraphPad Prism

**Moderators:** honeev, Leonid, amiradm, BioTeam

- Dr.Stein
- King Cobra
**Posts:**3501**Joined:**Thu Jul 07, 2005 7:58 am**Location:**55284 Yogyakarta, Indonesia-
**Contact:**

### GraphPad Prism

Anyone familiar with this biostatistic software? I want to have old version 3.0 , 4.0, or 4.3. Demo version will accepted. It can be used for 30 days

Thanks

Thanks

My school recommends this freeware

http://www.r-project.org/

http://www.r-project.org/

Living one day at a time;

Enjoying one moment at a time;

Accepting hardships as the pathway to peace;

~Niebuhr

Enjoying one moment at a time;

Accepting hardships as the pathway to peace;

~Niebuhr

I believe Excel will graph it for you. As for calculating it off the graph you need an equation. I will look around I know I used to have one in a file somewhere but Now I use Prism, StatView or SoftMax

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You know dog spelled backwards is god.

Coincidence? I think not. . .

You know dog spelled backwards is god.

Coincidence? I think not. . .

- CoffeaRobusta
- Garter
**Posts:**31**Joined:**Sat Apr 07, 2007 6:13 am**Location:**California, USA

What was wrong with this software that someone else told you to use?

http://www.cdc.gov/ncidod/dbmd/bimb/elisa.htm

I quote from the page:

http://www.cdc.gov/ncidod/dbmd/bimb/elisa.htm

I quote from the page:

ELISA for Windows is able to abstract the standard series, individual serum samples, and quality control samples from this file. The standards data are used to form a characteristic or standard curve which may be modeled using a three point cubic spline or afour parameter logistic-log function. The four parameters of the logistic function may be estimated using two methods: iteratively reweighted least squares and robust procedures. Estimation options include the Taylor series linearization (Gauss-Newton) and the Marquardt's compromise estimation algorithms. The standard curve is then used tointerpolate antibody concentrationsfor the patient isolates and quality control samples. Summary statistics are calculated from these concentrations (means, standard deviations, coefficients of variation, etc). ELISA for Windows also forms plots of the standards data with the estimated standard curve superimposed on the data points.

The 4-parameter logistic model equation assumes symmetry around the inflection point whereas the 5-parameter logistic model equation takes into account the asymmetry that is present in most bioassays including elisas.

Here is a blog post that goes into the 5-parameter logistic in more detail.

MasterPlex ReaderFit is specifically designed for drawing standard curves and curve-fitting of unknown points from elisa assays.

Allen

MiraiBio

http://www.myassays.com/four-parameter-fit.assay

http://www.myassays.com/five-parameter-fit.assay

These are preconfigured and require no download or installation.

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