# P&K 3950

## Program introduction

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## Regression calculation

The program carries out a regression calculation according to the guidelines VDI 3950 part 1 (1994-07). Besides linear and square functions, also logarithmic and exponential functions are determined.

An outliers test according to Grubbs (VDI 2449), independent of the regression calculation, and a significance test are integrated.

Parameters, like statistical certainty are variable and therefore calculations according to the guideline VDI 2066 (dust measurements) are possible.

Pairs of values can be deactivated or commented on. They can imported easily from ASCII files.

As described in the guidelines (as the regression formula y'=f(x) will be selected ), the square formula will be tested, if it is significantly better than the formula of the first degree.

The coefficients determined by the program can be replaced with own coefficients. Coefficients can be tested on a user defined basis, e.g. how numbers are rounded or a physical dependency. All characteristic values are derived from the users' coefficients. In addition, the function, determined by the program, can be displayed.

In a query block, characteristically values on the curves can be recalled, e.g. entering the X-value to receive the Y-values on all curves, or, any Y-value to receive all other values.

Full Windows support with appropriate intuitive operation. You no longer need to learn any code numbers for program control. You can select, from easily understandable lists, which variant the program is supposed to calculate. Now with more attractive lists and graphics, which can be printed to standard Windows printers or inserted via the clipboard to other programs. Also graphics can be zoomed or moved.

The program was created for you to be operated as easy and fast as possible. Therefore several tool were integrated. In the input tables one can move columns, so you can feed the data in the same order in accordance with your presentation. In addition you can determine when to append a new line. So you don't need to use the cursor controls unnecessarily to skip columns. Besides you can duplicate data sets and modify the status over a range of several data sets.

The program is present in German and English.

There are several value columns, which can be selected as X or Y-axis or can be determined from other columns like pressure, temperature, dampness or O_{2}-content. A user can select an expression or define its own expression to calculate a result e.g. standard state or state of operation.

The limit values can be calculated from the standard state or state of operation, though you can carry out the conversion not just by a factor, but also by pressure, temperature, dampness and O_{2}-content. For pressure, temperature, dampness and O_{2}-content the program can determine the average values from the input data.

As well as the well-known logs, there is a new report function, which produces the graphic and the individual tables in the order desired. The reports are produced in HTML-format and left in the data directory for your disposal. Of course, these documents can be modified with almost every text processing program.

At our website you can see the program documentation and sample reports, as well as download a demo.

see Version Review