3 Data Analysis

Data-Analysis

Curve Fitting - Fitting Control

• FAQ-222 What is the difference between global fit and independent fit?
• FAQ-223 How do I set the same bounds to parameters when fitting multiple datasets?
• FAQ-224 How to use the parameter values from the last fit as the new starting values
• FAQ-225 How do I fit all curves in my layer or graph?
• FAQ-226 How do I fit a part of the data plot in my graph?
• FAQ-228 How do I force my fit curve to go through a point?
• FAQ-630 How to open FDF files in Windows Explorer?
• FAQ-642 Which kind of weight can be used in fitting?
• FAQ-654 How to fit multiple datasets?
• FAQ-655 What kind of Fit Parameters (Error analysis) can be obtained in linear fit?
• FAQ-1012 Why Does "Fit until converged" Generate Different Results Than Multiples of "1 Iteration" When Peak Fitting?
• FAQ-1085 Why does my fit fail with no iterations and a message saying "reason unknown"?
• FAQ-1211 What is Scale Error with sqrt and why is it important?

Curve Fitting - Fitting Results

• FAQ-231 How do I know if my fit result is good?
• FAQ-232 How to identify the outliers in linear fit?
• FAQ-233 How to find a slope on the log-log plot?
• FAQ-234 How do I compare datasets or fitting models?
• FAQ-236 How to use the parameter values in the Script After Fitting
• FAQ-238 Why am I not getting a good fit?
• FAQ-239 What does the NLFit error code mean and what can I do?
• FAQ-240 Why is my fitting function not compiling?
• FAQ-241 Why does my fit curve appear jagged and not smooth?
• FAQ-242 Why is my Reduced Chi-Sqr value very different from 1?
• FAQ-243 Why my fit did not converge when I have exponential functions?
• FAQ-244 Why can I not reproduce the fit curve using reported parameters?
• FAQ-245 Why are fitted parameters different when fitting data are transformed?
• FAQ-631 How to report FWHM for each peak in a single dataset Gaussian fit?
• FAQ-635 How to display the fitting equation in the legend?
• FAQ-647 How to identify fitting results in report table by Dataset Identilier?
• FAQ-691 How to Find X/Y from Fitted Curves in Find X/Y table?
• FAQ-709 How do I refer to fitting parameters in the Set Column Values dialog?
• FAQ-770 How to customize the Report Table attached on the source graph for Linear and Nonlinear fitting?
• FAQ-774 Can I add fitting equation with parameter values to the graph in nonlinear curve fitting?
• FAQ-782 Why parameter's standard error remains unchanged when error bar is scaled?
• FAQ-937 What's the difference between SE and SD of fitted parameters in curve fitting?
• FAQ-965 How to turn off the fitting report table on graph?
• FAQ-1082 What's the difference between SE and SEM?

Linear and Polynomial Fitting

• FAQ-247 Why is R-Square greatly different when intercept is fixed in linear fit?
• FAQ-248 How do I interpret polynomial fitting results?
• FAQ-643 What is the Apparent Fit?
• FAQ-645 What kind of Fit Statistics can be obtained in linear fit?
• FAQ-646 How to control the Residual Analysis/Plots in linear fit?
• FAQ-693 How to perform Multiple Linear Regression with boundary or constraint?
• FAQ-968 How to determine whether the slope in a linear fit is significantly different from a specific value?
• FAQ-1024 How to perform linear fit on a part of the log-log plot?

Nonlinear Curve Fitting

• FAQ-251 How to compute EC50/IC50 in Dose Response fitting
• FAQ-252 How can I quickly carry out dose response analysis?
• FAQ-253 How do I perform curve fitting on my histogram plot?
• FAQ-254 How do I fit a single dataset with multiple instances of one function?
• FAQ-255 How do I fit replicate data?
• FAQ-256 How to write linear constraints in different fitting cases
• FAQ-257 How can I perform regression with multiple linear terms and obtain an analytical solution?
• FAQ-258 How can I carry out nonlinear curve fit with X error?
• FAQ-259 How to fit date and time data?
• FAQ-261 How do I call the NAG library in my user-defined fit equation?
• FAQ-262 How do I supply my own Equation and Sample Curve images for my fitting function?
• FAQ-263 How to include integrate in my fitting function
• FAQ-264 How to quote a built-in function when defining a user-defined function?
• FAQ-265 How to define an implicit function?
• FAQ-266 Why do I need to provide initial parameter estimates for my user-defined fitting
• FAQ-267 How do I speed up the fitting routine for the user-defined function with integration?
• FAQ-268 How to estimate initial parameters for rational functions
• FAQ-269 How to define an ordinary differential equation for fitting
• FAQ-501 What are the confidence intervals associated with 1σ, 2σ, 3σ, and etc. for Gaussian distribution?
• FAQ-619 What is the difference between these two sigmoidal fitting function, Logistic and Bolzmann?
• FAQ-653 How to use the gamma function in Origin?
• FAQ-676 We are trying to use a single exponential decay equation to determine the half-life of a compound, but your equation is slightly different than the standard form. How do we calculate the half-life?
• FAQ-750 How can I calculate propagation delay time between two signals?
• FAQ-858 How to build up a summation fitting function or a double integral fitting funtion?
• FAQ-1177 How to define a constant related to input data in a fitting function?
• FAQ-1231 How to fit with the Langmuir function?

Batch Processing

• FAQ-272 How do I automate repetitive tasks?
• FAQ-273 How do I keep certain data when saving an Analysis Template?
• FAQ-761 How to batch process multiple files in groups?
• FAQ-766 How to generate a customized Word report after batch processing?
• FAQ-769 Can I pre-process peak data, such as exclude unwanted data, before each analysis process?
• FAQ-976 Why does my Analysis Template file keep getting bigger?
• FAQ-1037 How to export graph during Batch Process?

General

• FAQ-275 How do I hide the Analysis Markers?
• FAQ-277 How do I know if an analysis result is not up to date?
• FAQ-278 How do I perform a different analysis on the same range?
• FAQ-279 What is the precision of results from analysis operations?
• FAQ-280 How do I perform analysis on a specific curve in my multi-curve plot?
• FAQ-281 Is there a User Community site to share tools and applications?
• FAQ-282 How do I convert date data from Matlab to Origin
• FAQ-283 How do I convert date data from Excel to Origin
• FAQ-284 Why do analysis markers look so small or so big?
• FAQ-285 What are these markers and what is this lock on my graph?
• FAQ-286 How do I define global variables and constants?
• FAQ-287 How to change the font size of footnote in the result sheet?
• FAQ-288 How to change the default value of Recalculate dropdown when open dialog?
• FAQ-309 How do I carry out deconvolution?
• FAQ-633 How to draw a line between two points to find the slope and y-intercept values?
• FAQ-648 How to specify the destinations of the output?
• FAQ-665 How do I exclude outliers from an analysis routine without deleting the data?
• FAQ-696 How to customize the shaded, integrated area under a curve?
• FAQ-721 How can I classify data into groups and colormap them from the graph directly?
• FAQ-805 How to compare the curves before and after recalculation?
• FAQ-826 How to revert the new report table Results ± Errors to old report table Results and Errors in two columns on graph?
• FAQ-855 Why does my DLL for fitting work in one PC but fail in another?
• FAQ-883 How to suppress the warning message dialog when I delete an analysis operation?
• FAQ-891 How can I control digits display in each analysis tool?
• FAQ-940 How do I highlight data points in multiple graphs simultaneously?
• FAQ-965 How to turn off the fitting report table on graph?
• FAQ-1036 How to go back to the source sheet or graph?
• FAQ-1057 How to link to local CSS and other files in HTML Reports?
• FAQ-1098 How does "Duplicate this Operation" work?
• FAQ-1207 How to convert the date time units of an analysis output?

Mathematics

• FAQ-290 Where can I find a list of available mathematical functions?
• FAQ-291 How do I normalize my data?
• FAQ-292 How do I perform calculations using worksheet data columns?
• FAQ-293 How to convert sphere coordinates to cartesian coordinates?
• FAQ-687 How to calculate derivative for all datasets in graph?
• FAQ-673 How can I find the x values where my data plot crosses the y=constant such as x axis?
• FAQ-694 How can I calculate the parameter value in a complex equation?
• FAQ-695 What is the difference between Integrate, integratexy and Integ1?
• FAQ-765 How to quickly define and access Project Variables in Set Values dialog?
• FAQ-961 How to get the difference or sum of two curves?
• FAQ-1013 Can I use a simple formula to do simple math on columns or curves?
• FAQ-1023 How do I synchronize two sensor signals recorded with different sampling rates?
• FAQ-1183 How to get the Z data in a specific X/Y value in Contour plot?

Peak Analysis

• FAQ-295 How do I calculate the FWHM?
• FAQ-296 How do I find the area under my curve?
• FAQ-297 How do I locate the peaks in my data?
• FAQ-298 How do I set the bound for fitting for some functions?
• FAQ-299 What are the various options for analyzing peak data?
• FAQ-300 How do I perform Peak Deconvolution?
• FAQ-778 How to create baseline with Asymmetric Least Squares method?
• FAQ-808 Why my peak fitting with user-defined function is slow? How to speed it up?
• FAQ-812 How can I plot subtracted data in result graph?
• FAQ-964 Why there are negative peaks when I deconvolute peaks, how to make them always be positive?
• FAQ-1230 Why is Gravity Center from peak analysis missing for some peaks?

Signal Processing

• FAQ-302 How do I smooth my own data, so I don't get a new curve drawn on top?
• FAQ-303 Does Origin support LOESS or LOWESS regression?
• FAQ-304 Does the FFT computation truncate or pad my data?
• FAQ-305 How do I compute autocorrelation on a signal?
• FAQ-306 How do I perform FFT when my time data is not evenly spaced?
• FAQ-307 How do I remove DC offset before performing FFT?
• FAQ-308 Why is my FFT result different from that in Origin7.5?
• FAQ-634 How can I smooth the contour lines in a contour plot?
• FAQ-698 How can I show Pseudo-Frequency axis scale in cwt image plot?
• FAQ-948 How to remove baseline for the XRD data?

Statistics

• FAQ-311 Can we put results of statistics on column to a worksheet?
• FAQ-312 Does Mann Whitney Test support raw data in Origin?
• FAQ-313 Does Origin support Multivariate Analysis?
• FAQ-314 Does Origin supports Welch's t-test?
• FAQ-315 How can I align outliers in a line in box chart?
• FAQ-316 How can I customize the scatter matrix plotted with the correlation coefficient tool?|
• FAQ-317 How can I draw data on the top of the box chart?
• FAQ-318 How can I know the best representative sample within each cluster in cluster analysis?
• FAQ-319 How can I perform t-tests on rows?
• FAQ-320 How can I plot a 3D histogram?
• FAQ-321 How can I plot a histogram with counts as label?
• FAQ-322 How can I show data from different groups within one box chart?
• FAQ-323 How can I calculate a simple moving average?
• FAQ-324 How can I calculate the moving median?
• FAQ-325 How do I overlay a distribution curve on my histogram plot?
• FAQ-326 How to add scatter label for Score Plot/Biplot in Principal Component Analysis?
• FAQ-327 How to compute the critical value of t distribution?
• FAQ-328 How to perform distribution fit
• FAQ-329 How to plot a p-p plot with confidence intervals?
• FAQ-330 How to plot the kernel density graph?
• FAQ-331 What can I do if I have more than 10 columns to be run for ANOVA?
• FAQ-332 What is balanced design?
• FAQ-333 What is indexed versus raw data and how to I transform from one to another?
• FAQ-334 Where can I find a list of available statistical functions?
• FAQ-490 How do I identify and eliminate outliers?
• FAQ-729 How can I put the results of Statistics on Columns in the source worksheet?
• FAQ-837 How to group data into bins and sum up the data of each bins respectively?
• FAQ-877 How to calculate the parameters of the correlation ellipse?
• FAQ-878 How to eliminate the outliers by a user-defined defination?
• FAQ-987 Why SE of mean got in ANOVA is different from the one got in statistics on column?
• FAQ-1156 How to get "exact P values" in ANOVA tools?