regression testing pdf

/Type /XObject 8BIM� H /ff lff /ff ��� 2 Z 5 - 8BIM� p ����������������������� ����������������������� ����������������������� ����������������������� 8BIM 8BIM 8BIM @ @ 8BIM � � � � � ���� JFIF H H �� 'File written by Adobe Photoshop� 4.0 �� Adobe d� �� � ���� JFIF H H ��FPhotoshop 3.0 8BIM� G�� G�� 8BIM� 8BIM Regression Testing Plan Project Name Version Confidential – ©2015 Documentation Consultants ( Document: 5450 Page 5 of 12 2 What is Regression Testing 2.1 Purpose The purpose of Regression Testing is to seek to uncover new errors, or regressions, in existing Normality: The data follows a normal distr… :>�Uz�@���׺��u���{�{�^���׺�X�� �?����~�׺�ߺ�^���^�׺� �=��u�W6����G�u�|��0?�Ϳ���Z뗿u�۞/���n}��u�`�����u�(i�/~�]{ߺ�^��׽��u�~��{ߺ�^��׽��u�~��{ߺ�^��׽��u�~��{ߺ�\usn?׿�O~��w��{����u�~��p�?ۛ{�^럿u���{�{�^���׺��u�&�����{����Sߺ�\���u�~��{ߺ�_��:>�Uz�@���׺��u���{��6. /FormType 1 /PTEX.InfoDict 12 0 R Regression testing is responsible for the overall stability and functionality of the existing features. �%�wG��E�Ϛ��Jޣ�KKw�Ɲ�BQN�����#�!&b�:_�xa��L��IP�R�e���B�N�G��Wl�#ށ�n�@,����=� ���A����?�_���^8�b��tBv����!튴B�� .���0I�^�iϊH�#�D�;̬w�����(Qh�Q�/�`�6�+0����h E�C�L"��F�^ס���T"�Zh#�IY�(R�ēsb$i+7{V�q��X��@O2w\���x0T��L�@$��d << /Length 15 0 R /Type /XObject /Subtype /Image /Width 362 /Height 45 /Interpolate Regression testing can apply to web tests, mobile tests, and cross browser / … The app had to be integrated with a branded mini-camera that allowed iOS device owners to take professional photos. 5 0 obj << 5 0 obj ISTQB Definition. /Filter /FlateDecode 3. There are sub-categories such as functional regression testing and visual regression testing, both of which Applitools helps with. << /Length 5 0 R /Filter /FlateDecode >> Availability of test plan – Testing starts with a specification, an implementation of the specification and a test plan (black-box and/or white-box test cases). You can also view more advanced guides about Regression testing in pdf at the end of this tutorial. Use the two plots to intuitively explain how the two models, Y!$ 0 %$ 1x %& and (b) What change in gasoline mileage is associated with a 1 cm3 change is engine displacement? PDF | After reading this chapter, you should understand: What regression analysis is and what it can be used for. /Subtype /Form Simple linear regression is a parametric test, meaning that it makes certain assumptions about the data. << /ProcSet [ /PDF /Text /ImageB /ImageC /ImageI ] /ColorSpace << /Cs1 7 0 R Regression testing is a type of software test that assesses if changes to an application, or other related software components, introduce defects. 1 0 obj Regression testing often involves running existing tests again so testers might not be overly enthused at having to re-run tests. x�m�I�-� E�oo��2(�����|.C�"F}ާ�bOF�+�����������?��?_�g�F��?/���J��+�/��k>_�yq��)W�������[��r���\Ǖz{�~Ş�;�z�2�-\m����k�+�|V��=�ڦ�2ΫDN��m�NC��bʡ"�~����3_�5�q�Ƽ���1\%^:ӕ;+�5k�N�*�(с��%!�8�P��;c�Sy����|J᪓KPjH���#h<7v�f�+��T��hט�sH���WΘC*�`׀���Uѝ�\���XȑO�ʡ��虈� 1櫋�9�S)(�;��D�i\���`�U�b�yU�q#��X�F���C�R���q���*]D8��?�:� ���J� ��|�$E��O O,�LY,2Ļ Regression testing is performed after making a functional improvement or repair of software. ��5'�S6��DTsEF7Gc(UVW�����d�t��e�����)8f�u*9:HIJXYZghijvwxyz������������������������������������������������������� m!1 "AQ2aqB�#�R�b3 �$��Cr��4%�ScD�&5T6Ed' What is Regression Testing? Schedule the tests. The Extent of Regression Testing. Assumption 2: X values are xed in repeated sampling. u!" Regression testing is the process of performing software testing against a change to an application. It aims to verify that no new change in the product breaks the existing functionality during the on-going development. Traditional regression tests are often partially automated. 660 8BIM' Regression tests give assurance to systems management, developers, testers and users that new system is … Assumption 3: The expectation of the disturbance u i is zero. 2 0 obj REGRESSION TESTING is a type of software testing that intends to ensure that changes (enhancements or defect fixes) to the software have not adversely affected it. Regression Testing vs. /Length 3611 /Im1 12 0 R /Im3 16 0 R >> >> /Parent 11 0 R >> Mar 31, 2020 - Explore Shubhashmistry's board "Regression testing" on Pinterest. Integrate with the builds. 11-18. These assumptions are: 1. Linear Regression as a Statistical Model 5. Another issue is how to add categorical variables into the model. In order to /Resources << This is a partial test because βˆ j depends on all of the other predictors x i, i 6= j that are in the model. >> stream A quality assurance ( QA ) engineer performs these exercises to see if modifications to code break or hinder the way in which the application works or how it consumes resources. With regression testing you can quickly determine if changes to stylesheets are producing the desired results in your documents by reviewing both original and new documents through PDF visually comparing software. /Cs2 8 0 R >> /Font << /F1.1 10 0 R /F2.0 11 0 R >> /XObject << /Im2 14 0 R /ProcSet [ /PDF ] Test cases are re-executed to check the previous functionality of the application is working fine, and the new changes have not produced any bugs. interview perspective, you will be asked to define regression testing 2 0 obj << stream In statistical modeling, regression analysis is a set of statistical processes for estimating the relationships between a dependent variable (often called the 'outcome variable') and one or more independent variables (often called 'predictors', 'covariates', or 'features'). Regression testing can help you eliminate a lot of threats that are linked with software updates. Examples of categorical variables are gender, producer, and location. s��Ft����UeuV7��������)��������������(GWf8v��������gw��������HXhx��������9IYiy��������*:JZjz���������� ? REGRESSION TESTING is defined as a type of software testing to confirm that a recent program or code change has not adversely affected existing features. What is Regression Testing? /Length 313 Homogeneity of variance (homoscedasticity): the size of the error in our prediction doesn’t change significantly across the values of the independent variable. 2. Testing Regression Testing is not a simple extension of testing Main differences are: 1. See more ideas about Regression testing, Software development, Software testing. /PTEX.FileName (C:/Users/Stuart/Documents/Teaching/Inf3/Software\040Testing/stcoursematerials/2011newslides/school_of_informatics.pdf) endobj ]�~���F�] /Resources 4 0 R �� �" �� ��? regression knows how to include curvilinear components in a regression model when it is needed. It aims to verify that no new change in the product breaks the existing functionality during the on … endobj Costs of test maintenance and test … As in simple linear regression, under the null hypothesis t 0 = βˆ j seˆ(βˆ j) ∼ t n−p−1. 1A2# QBa$3Rq�b�%C���&4r If not, that would be called a regression.Changes that may require regression testing include bug fixes, software enhancements, configuration changes, and even substitution of electronic components. %���� endobj }x�y��n�}���� �/MV��?Y�m�|��ݥu6H�f7��c>��� Ԋ�_�v7��Nȯf�R6�?f۷�~����?��Q����z�hٵ�����n�ߵ;� v?���y�>/k��>:�!����V. ... with the regression model. /Filter /FlateDecode 3 !1AQa"q�2���B#$R�b34r��C%�S���cs5���&D�TdE£t6�U�e���u��F'���������������Vfv��������7GWgw�������� 5 !1AQaq"2����B#�R��3$b�r��CScs4�%���&5��D�T�dEU6te����u��F���������������Vfv��������'7GWgw������� ? Testing Software Quality Characteristics – Part 1 Regression Testing Objective Objective Utilize various strategies 0�X� �����?��}Ţ���~0����T\l�!Ǽ�ܟ�[Wp���2,,?�{#���9o�c�_� w}�1 fN� �"u��x)��BS#E��*�*�[�g�f7I4U�Sy���c�3�#�I_Aƽpp�)�]��&%��9Z���a��M�Z Changes may include software enhancements, … TestComplete allows you to create and maintain automated regression tests across web, mobile and desktop applications. The focus of the testing is to ensure that changes made to the application did not introduce any bugs. Regression Testing is nothing but a full or partial selection of already executed test cases which are re-executed to ensure existing functionalities work fine. x�TMo�0��Wp7gXQ_����zh;;Y�uH�%i��?Ғ��i��!�"���(���0��%�n��g;��`PDM�x��G�Gl"E��`�^��i�Jǭ�P[/��E��z�֐Na]��%��@.��2�v �KBR��w#h�E����c�Zk�t�8>h�Gu8�@�� (a) Write the new regression model. %PDF-1.3 xڅ�AO�0���>���8���&�1rh�։v��vB� U��:/�}5Ё�UA�:�����8��1��6�"�|06��1��®x������&W��6\t�vZ2�(��a#i/��v�Ǿ�ه2U�-����-=���5轕�!��"�Y����^�X'�`.��m;�*�狻����9��w9��Á���H���!$\�!�F.���6�0�����>������`t[�+*�����TE��rG9�� x�"�A�2_���Ʉ&��D-h8B��{5$߸~�kX�i�)k�&�? >> \?�x��cZg8K_�������=Y������K#���]k��v�Gk��\���+�����J0 Unlike regular numeric variables, categorical variables may be alphabetic. �,�C�{�*�4Tr� Ӽ���vM��;F|��k`�f�4cq�� ����PL �@���q#���h�$)�����2� �H5^-4n��zu�[g�vV,1�(WM�Ш�Y���������~ G}�:��r~O-y�2J#5\Wr�|�B��u�fW�8cGO,O�T�^�t�������p�����Wnds�O������WU�g��b� }���ޘ��f߹H�$ �R�w,6�A��E��Px���aEAb�i��Xld�O�� ‘�ېj�< Show that in a simple linear regression model the point ( ) lies exactly on the least squares regression line.x, y ( ) points. The FDA makes this recommendation for companies using a software development … Regression Testing is a type of testing that is done to verify that a code change in the software does not impact the existing functionality of the product. Regression testing can be performed on a new build when there is … Regression testing is a type of software testing which verifies that software which was previously developed and tested still performs the same way after it was changed or interfaced with other software. /MediaBox [0 0 841.89 595.276] Verify applications with Checkpoints. /BBox [0 0 207 40] true /ColorSpace 8 0 R /BitsPerComponent 8 /Filter /DCTDecode >> The project featured an iOS image processing app for a company specializing in processing, storing, printing and displaying digital images. Regression testing is a type of software testing. Regression testing is an incremental validation technique for testing a product. Everything is new – Regression testing starts with a (possibly modified) regression testing: A type of change-related testing to detect whether defects have been introduced or uncovered in unchanged areas of … ���:�쭧�z��J��' �q���~���MW��}`ߊ�H"�tƸzUqsm���� �o�� �,�� on���nnݾ�������?�� u��������?��_O�_b�� ���o�if���|����b4w��?�du���X�;���/����?Xnǡ�W. It also has the same residuals as the full multiple regression, so you can spot any outliers or influential points and tell whether they’ve affected the estimation of … Regression analysis is a related technique to assess the relationship between an outcome variable and one or more risk factors or confounding variables. You can conduct this testing at any level of testing be it Unit, Integration, System, or Acceptance, but it is more appropriate to conduct it during system testing. >> %��������� It is a tool in helping to provide stability in the face of code change. In risk-oriented regression testing, we test the same areas as before, but we use different (increasingly complex) tests. A partial regression plotfor a particular predictor has a slope that is the same as the multiple regression coefficient for that predictor. )2Ė>ˋ���x`%L�f�lD"��c�M�)���'��y�y�1�ZU�Ͻ���:D5�����3�X��^x~m���5�����O��JƳ��!�������y�,�%��ѫj%���Wƿ��>]ʮ�le�d�e����U��捴��u�6�9�0�[�at�4�.��Y��b�Y���O���-��4|�F �l;10�%R�)VM=a�۽����X��i�b���M���3��Jϻ����6�A�� &m��~/s`�CU������^�A��{hD /Type /Page stream Regression testing (rarely non-regression testing) is re-running functional and non-functional tests to ensure that previously developed and tested software still performs after a change. The FDA’s General Principles of Software Validations recommends using visual regression testing for images and documents. Manage Regression Tests/update when required. Time Consuming: Regression testing can take a lot of time to complete. ;s����?s�v��Xc,�A����ӡ��Y������� /��:��L|��0G�nX`ӧ��ۨ��n��E�mE�����_�8����� ����6G�w�~�;������Wv� ��6�S�� �� �qr�����/���TG�%c_9��g���_��g��b��X��+�J��pߖ������'�`�_X��~�,tXzf� �S����� ��{ڰ���}Y��n�o�� ��� ��n���yf��οg�� ��'��6O��j"?�ط��� '�%c$��������K�'c�}d�ťֵ�s���Eu6]ns���1��*g�������*�ns�si� �g,�eC�� ���Z�o�6����ctF�d'��?���ݧw���wDn���}o�� ����x��.TG����ض����6'�y�s����vm�� Y7fǩ�wTۣzM�Ї�*w~�ߘ��Ծ�2�Ccb솈 �۫�����Z�?n�n�f_�ws��7����?o��ՙt��v��� ��J3�l�@�Q�hr�?K��PG����ӹ�#(�� ��� ���_�-�5�yk��C"�e�7�}W���~�J����f!-��0�v��_p�}��v��#~�#o�2ȍ�������v��۷��͑����� �P�?͒k������� � ���e� bI#��������3���~�?��c�h��C5'=�C��mY�i��^]u��?2��� ŬF��h��m��6��� g�� �S����ެC�N�ߥ�� ]�s�8�C�3�\3:��/��� 6����w��98x� D����8BIM �� 'File written by Adobe Photoshop� 4.0 �� Adobe d@ �� � �� -j �� .��� Let me present an example showing how automated visual regression tests for web sites and PDF-documents can be implemented to automatically verifies regulatory requirements. 3 0 obj << Y = 1 + 2X i + u i. These note focus on traditional regression. View Regression Testing.pdf from CSE 565 at Arizona State University. << /Type /Page /Parent 3 0 R /Resources 6 0 R /Contents 4 0 R /MediaBox [0 0 842 595] 4 0 obj Regression testing can be used throughout the lifecycle. Its purpose is to determine if the change has affected other aspects of the software. 6 0 obj endobj It can reduce the cost of applying tests (by storing the expected result). /PTEX.PageNumber 1 Regression testing provides a tool for managing change. endobj The project lasted for about three years and involved 4-12 specialists at different stages, including 1-5 testing engineers. -E5�¤7��v�$rH��QtUI>�� �"�x���l3��~z�_��c��"w�}�Q�ޓ�%������4���8� << /S /GoTo /D [2 0 R /Fit] >> “Testing of a previously tested program following modification to ensure that defects have not been introduced or uncovered in unchanged areas of the software, as a result of the changes made is called Regression Testing.”A regression test is a Independence of observations: the observations in the dataset were collected using statistically valid sampling methods, and there are no hidden relationships among observations. Regression Testing Steps: Regression tests are the ideal cases of automation which results in better Return On Investment (ROI). endstream endobj While regression testing is a vital element of the QA process, there are a number of challenges it brings. This is to make sure the product works fine with new functionality, bug fixes or any change in the existing feature. Assumptions of OLS regression Assumption 1: The regression model is linear in the parameters. endstream 14 0 obj The project team followed the Scrum methodology with two-week sprints. It will enable you to quickly create automated GUI tests in one browser and run them in parallel across 1,500 remote test environments – including browsers, operating systems, resolutions, and devices – helping you ensure complete test coverage and improve software quality. >> endobj This does not mean that Y and X are linear, but rather that 1 and 2 are linear. Multiple Linear Regression and Matrix Formulation Introduction I Regression analysis is a statistical technique used to describe relationships among variables. Regression testing is one of the most important aspects of software testing and is often overlooked or given scant attention. stream When to carry out Regression Testing? Regression testing is a software testing practice that ensures an application still functions as expected after any code changes, updates, or improvements. Rerunning of tests can be on both functional and non-functional tests. %PDF-1.5 We reject H 0 if |t 0| > t n−p−1,1−α/2. The outcome variable is also called the response or dependent variable and the risk factors and confounders are called the predictors , or explanatory or independent variables . Thus, this is a test of the contribution of x j given the other predictors in the model. �{+�z�2a �=�ƨi�p����t;���;��O��ן7w~�W��c���F@-|�������c%���r�w�@(� �ѐ����cW���7�q���y �ݞom����B��]?�/�A�G1�[J�E)��v���X�p(]m�5*�Z����׈u���Tah9d�C���:x�,�7���}�7��.�RG��ښ�gt�Y�E%�f��d�\r�#rޞ. 4. Choose the apt tool and automate the Regression Tests. Analyze the results Select the Tests for Regression. Here, it’s . What is regression testing? I The simplest case to examine is one in which a variable Y, referred to as the dependent or target variable, may be /Contents 5 0 R

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