2.4.2 fitcmpdata(Pro)
Menu Information
Analysis: Fitting: Compare Datasets
Brief Information
Compare two datasets using a specified fitting model
Additional Information
It is not accessible from script. This feature is for OriginPro only.
X-Function Execution Options
Please refer to the page for additional option switches when accessing the x-function from script
Variables
Display
Name
|
Variable
Name
|
I/O
and
Type
|
Default
Value
|
Description
|
| Fit Result1
|
result1
|
Input
Range
|
|
Specifies fit report sheets fitted with the same model and different dataset.
|
| Fit Result2
|
result2
|
Input
Range
|
|
Specifies fit report sheets fitted with the same model and different dataset.
|
| Significance Level
|
sl
|
Input
double
|
0.05
|
Values between 0 and 1 are supported.
|
| Fit Parameters
|
param
|
Input
int
|
1
|
Decide whether to output Fit Parameter table for each dataset.
|
| Fit Statistics
|
statics
|
Input
int
|
1
|
Decide whether to output Fit Statistics table for each dataset.
|
| 1st Dataset Name
|
name1
|
Input
string
|
Data1
|
Specify the display name for the first dataset in the report sheet.
|
| 2nd Dataset Name
|
name2
|
Input
string
|
Data2
|
Specify the display name for the second dataset in the report sheet.
|
| Results
|
rt
|
Output
ReportTree
|
<new>
|
Specify where to put the output report.
|
Description
This tool compares two datasets by fitting the same function. It is used to determine whether two datasets are significantly different from each other for the same fitting model. Thus, the tool determines if the two datasets are representative samples from the same population or not.
To use this tool, please pay attention to following
- Input for this tool is fit report sheets (Linear Fit, Polynomial, Nonlinear Curve Fit, etc). So fit tools need to be run before you use this tool
- When use the fit tool, please set recalculate mode of fit tools as Auto or Manual
- Consolidated Report (all the fitting result reports of multi-datasets are in one worksheet) can not be recorgnized, so we need to ensure that results are in separate sheet when fitting multiple datasets.
Examples
This example implements the data comparison below with Labtalk script.
fname$=system.path.program$ + "Samples\Curve Fitting\Exponential Decay.dat"; // prepare the data
newbook;
impasc;
nlbegin 1!2 ExpDec1 tt; // nonlinear fitting on column 2
nlfit;
nlend 1 2; ;
nlbegin 1!3 ExpDec1 tt; // nonlinear fitting on column 3
nlfit;
nlend 1 2;
fitcmpdata -r 2 result1:=2! result2:=4!; // compare the two datasets based on the fitting results of the exponential function.
Suppose we have 2 datasets and would like to see whether they are different for same model,
Operation
1. Import Exponential Decay.dat on \Samples\Curve Fitting folder.
2. Highlight Col(B), select Analysis: Fitting: Nonlinear Curve Fit to open dialog. Set Function as ExpDec1. Click OK to get result sheet.
3. Highlight Col(C) and select Analysis: Fitting: Nonlinear Curve fit: 1<last used> to quick fit Col(C) with same model.
4. Select Analysis: Fitting: Compare Datasets to open dialog.
5. Click browse button to open Report Tree Browser and select 1 item for Fit Result1.
6. Repeat same operation to select another item for Fit Result2.
7. Select Fit Parameters and Fit Statistics and click OK.
8. From F-test table, we can roughly draw conclusion that Col(B) and Col(C) are different when fit with expDec1 model.
Algorithm
F Statistic:
- Where
 , 
- RSS1 is residual sum of square of fit with 1st dataset, RSS2 is residual sum of square of fit with 2nd dataset. SSRcombined is residual sum of square of fit with combined data of 1st dataset and 2nd dataset.
Prob:
- 1-
Related X-Functions
fitcmpmodel
|