Discussion: Candidates for The Senatorial and Gubernatorial Races

Discussion: Candidates for The Senatorial and Gubernatorial Races ORDER NOW FOR CUSTOMIZED AND ORIGINAL ESSAY PAPERS ON Discussion: Candidates for The Senatorial and Gubernatorial Races Methods Report for Vanderbilt University’s: Tennessee Horserace Poll 2018 Survey of TN Registered Voters Age 18+ October 16, 2018 Prepared by: Chintan Turakhia, Jonathan Best, and Jennifer Su 1 Braxton Way Suite 125 Glen Mills, PA 19342 @ssrs_research | 484.840.4300 | [email protected] CONTENTS OVERVIEW ………………………………………………………………………………………………………………………………………. 3 QUESTIONNAIRE DEVELOPMENT …………………………………………………………………………………………………… 3 SAMPLING METHODS ……………………………………………………………………………………………………………………… 3 CONTACT PROCEDURES ……………………………………………………………………………………………………………….. 3 DATA COLLECTION, PROCESSING, AND INTEGRATION…………………………………………………………………. 4 Survey Administration ……………………………………………………………………………………………………………………. 4 Data Processing and Integration …………………………………………………………………………………………………….. 4 WEIGHTING AND ANALYSIS ……………………………………………………………………………………………………………. 4 Base weight ………………………………………………………………………………………………………………………………….. 4 Post-stratification…………………………………………………………………………………………………………………………… 5 Effects of Sample Design on Statistical Analysis ……………………………………………………………………………… 6 RESPONSE RATES ………………………………………………………………………………………………………………………….. 7 DELIVERABLES ……………………………………………………………………………………………………………………………….. 9 ABOUT SSRS …………………………………………………………………………………………………………………………………… 9 Note: SSRS is proud to be a Charter Member of the American Association for Public Opinion Research’s (AAPOR) Transparency Initiative. We support and encourage transparency in the reporting of research results and are committed to AAPOR’s Code of Professional Ethics and Practices. 2 OVERVIEW The Center for the Study of Democratic Institutions (CSDI) at Vanderbilt University regularly conducts public opinion polls of Tennessee registered voters to provide non-partisan, scientifically-based public opinion data. Discussion: Candidates for The Senatorial and Gubernatorial Races These polls provide point-in-time data to find out what registered voters in Tennessee think about national, state, and local public policy issues. CSDI at Vanderbilt commissioned SSRS of Glen Mills, PA to conduct the Center’s Tennessee Horserace Poll 2018 before the midterms elections. The Tennessee Horserace Poll 2018 obtained telephone interviews with a representative sample of 800 registered voters, age 18 or older, living in Tennessee. Telephone interviews were conducted by landline (560) and cell phone (240, including 180 without a landline phone). Interviews were done in English from October 8-13, 2018. Statistical results are weighted to correct known demographic discrepancies. The margin of sampling error for the complete set of weighted data is ± 4.9 percentage points. Details on the design, execution and analysis of the survey are discussed below. QUESTIONNAIRE DEVELOPMENT The questionnaire was developed by the Principal Investigators at the Center for the Study of Democratic Institutions (CSDI) at Vanderbilt in consultation with the SSRS project team. Prior to the field period, SSRS programmed the study into CfMC 8.6 Computer Assisted Telephone Interviewing (CATI) software. Extensive checking of the program was conducted to ensure that skip patterns and sample splits followed the design of the questionnaire. SAMPLING METHODS The target population for this poll was Tennessee registered voters age 18 or older. SSRS used a registrationbased sampling (RBS) approach. RBS sample was procured from Aristotle one of the major providers of voter list samples. Samples were provided according to SSRS specifications. The sample frame was split into eight strata: [1] 18-29 with landline; [2] 30-44 with landline; [3] 45-64 with landline; [4] 65+ with landline; [5] 18-29 with only cell phone; [6] 30-44 with only cell phone; [7] 45-64 with only cell phone; [8] 65+ with only cell phone. Records with both a landline and cell phone were included in the landline strata. A separate sample was drawn in each stratum. The sample size for this poll was n=800 interviews. Overall, 70% of respondents were reached via landline and 30% of respondents were reached via cellular telephone. The majority of the voter list is comprised of landline telephone records. CONTACT PROCEDURES For respondent selection for landline sample, interviews were conducted with the youngest adult 18+ male/female at home based on a random rotation. For the cellular sample, interviews were conducted with the person who answered the phone. Interviewers verified that the person was an adult and in a safe place before administering the survey. For both landline and cell samples, after an adult was on the phone, geographic eligibility and current voter registration status were determined prior to accepting the respondent into the survey. 3 DATA COLLECTION, PROCESSING, AND INTEGRATION Survey Administration The field period for this study was October 8-13, 2018. Discussion: Candidates for The Senatorial and Gubernatorial Races All interviews were completed in English using the CATI system. The CATI system ensured that questions followed logical skip patterns and that complete dispositions of all call attempts were recorded. CATI interviewers received written materials about the survey instrument and received formal training for this particular project. The written materials were provided prior to commencement of data collection and included an annotated questionnaire that contained information about the goals of the study, detailed explanations about why questions were being asked, the meaning and pronunciation of key terms, potential obstacles to overcome in getting good answers to questions, and respondent problems that could be anticipated ahead of time, as well as strategies for addressing the potential problems. Interviewer training was conducted before the study was launched. Interviewers were given instructions to help them maximize response rates and ensure accurate data collection. In order to maximize survey response, SSRS enacted the following procedures during the field period: • • • • • As many as five (5) attempts were made to contact every sampled telephone number. Calls were staggered over times of day and days of the week to maximize the chance of making contact with potential respondents. At least one daytime call was conducted if necessary. Interviewers explained the purpose of the study and its importance. Respondents were offered the option of scheduling a call-back at their convenience. Specially trained interviewers contacted numbers where the initial call resulted in respondents hanging up the phone. Data Processing and Integration Prior to running cross-tabulations, data were cleaned and checked using standard procedures. This program establishes editing parameters in order to locate any errors. Minimal back-coding was done for Question RACE to code open-end responses into prelisted categories where appropriate. No other coding was done for openend responses. WEIGHTING AND ANALYSIS Weighting is generally used in survey analysis to compensate for sample designs and patterns of non-response that might bias results. Discussion: Candidates for The Senatorial and Gubernatorial Races The weighting ensures that the demographic profile of the sample matches the profile of the target population. The data was weighted to match Tennessee registered voter parameters. The sample was weighted in two stages. The first-stage of the weighting was the application of a base weight to account for different selection probabilities. In the second stage of weighting, sample demographics were matched to population parameters. Base weight The sample frame was divided into strata based on age, and younger registered voters were sampled at higher rates in order to get more young respondents. The first step of the weighting was to compute a base weight to 4 account for the disproportionate sampling across strata. Base weights were computed so that the base weighted distribution of the sample drawn across strata was the same as the distribution of the entire sample frame across the strata. The baseweight for cases in stratum ?? can be expressed as: ????$ = ??$ ??$ Where ??$ is the size of stratum ?? and ??$ is the amount of sample drawn from stratum ??. Post-stratification The second stage of weighting balanced sample demographics to population parameters. The sample was balanced by form to match Tennessee registered voter parameters for sex, age, race, education, region, and party ID. The basic weighting parameters came from a special analysis of the Current Population Survey, November 2018: Voting and Registration Supplement. The region parameter came from the U.S. Census Bureau’s 2011-2015 5-Year American Community Survey (ACS) data. The party ID parameter came from an analysis of recent combined SSRS Omnibus data. The following table lists the dimensions used in the raking.Discussion: Candidates for The Senatorial and Gubernatorial Races Table 1: Raking Dimensions Dimension Value Label Male Sex Female 18-29 30-34 35-44 Age 45-54 55-64 65+ White, not Hispanic Race/Ethnicity Other HS graduate or less Education Some college/Associates degree College graduate East Nashville Region Central Memphis/West Democrat Party ID Republican Independent / Other Weighting was accomplished using SPSSINC RAKE, an SPSS extension module that simultaneously balances the distributions of all variables using the GENLOG procedure. Weights were trimmed to prevent individual 5 interviews from having too much influence on the final results. The use of these weights in statistical analysis ensures that the demographic characteristics of the sample closely approximate the demographic characteristics of the target population. Table 2 compares weighted and unweighted total sample distributions to population parameters. Table 2: Population Parameters and Weighted and Unweighted Total Sample Distributions Characteristic Value Label Parameter Unweighted Weighted Male 46.3 43.4 45.2 Sex Female 53.7 56.6 54.8 18-29 14.7 4.0 11.2 30-34 8.5 2.0 7.8 35-44 15.8 11.3 17.1 Age 45-54 16.2 15.6 17.6 55-64 20.3 28.3 22.3 65+ 24.5 38.9 24.0 White/not Hispanic 80.0 84.5 79.9 Race/Ethnicity Other 20.0 15.5 20.1 HS Grad or less 41.6 23.4 37.3 Education Some College/Assoc. Degree 24.2 29.6 25.2 College Graduate 34.2 47.0 37.4 East 36.9 37.0 34.7 Nashville 23.5 25.1 25.0 Region Central 20.4 21.8 21.1 Memphis/West 19.2 16.1 19.2 Democrat 24.2 25.4 24.9 Republican 30.1 39.9 30.0 Party ID Independent/ Other 45.0 33.9 42.5 DK/Ref 0.7 0.9 2.6 Effects of Sample Design on Statistical Analysis Post-data collection statistical adjustments require analysis procedures that reflect departures from simple random sampling. SSRS calculates the effects of these design features so that an appropriate adjustment can be incorporated into tests of statistical significance when using these data. The so-called “design effect” or deff represents the loss in statistical efficiency that results from a disproportionate sample design and systematic non-response. Discussion: Candidates for The Senatorial and Gubernatorial Races The total sample design effect for this survey is 2.03. SSRS calculates the composite design effect for a sample of size n, with each case having a weight, ?? as: ???????? = 6 ?? ? ??(? ??)- In a wide range of situations, the adjusted standard error of a statistic should be calculated by multiplying the usual formula by the square root of the design effect (0????????). Thus, the formula for computing the 95% confidence interval around a percentage is: ??? (1 ? ??? ) < ??? ± 40???????? × 1.96: ?? where ??? is the sample estimate and n is the unweighted number of sample cases in the group being considered. The survey’s margin of error is the largest 95% confidence interval for any estimated proportion based on the total sample — the one around 50%. For example, the margin of error for the entire sample is ± 4.9 percentage points. This means that in 95 out every 100 samples drawn using the same methodology, estimated proportions based on the entire sample will be no more than 4.9 percentage points away from their true values in the population. The margin of error based on Form 1 or 2 respondents is ± 7.3 percentage points. Margins of error for subgroups will be larger. It is important to remember that sampling fluctuations are only one possible source of error in a survey estimate. Other sources, such as respondent selection bias, questionnaire wording, and reporting inaccuracy, may contribute additional error of greater or lesser magnitude. RESPONSE RATES Table 3 reports the disposition of all sampled telephone numbers ever dialed from the original telephone number samples. The response rate estimates the fraction of all eligible sample that was ultimately interviewed. Response rates are computed according to American Association for Public Opinion Research standards.1 • • The response rate for RBS landline was 7 percent. The response rate for RBS cell was 5 percent.Discussion: Candidates for The Senatorial and Gubernatorial Races The American Association for Public Opinion Research. 2016. Standard Definitions: Final Dispositions of Case Codes and Outcome Rates for Surveys. 9th edition. AAPOR. 1 7 Table 3: Sample Disposition RBS LL 90 12 0 1 103 RBS CELL 94 16 1 4 115 TOTAL 184 28 1 5 218 3,602 333 3,935 710 3 713 4,098 4,098 1,628 1,628 5,726 NA/Busy all attempts 5,726 UHUONC = Non-contact, unknown if household/unknown other 2,046 819 11 2,876 2,632 71 0 2,703 4,678 890 11 5,579 1,246 1,466 2,712 773 1,068 1,841 2,019 Refusals 2,534 Callbacks 4,553 UOR = Refusal, unknown if eligible 7 33 40 0 45 45 34 69 103 34 114 148 49 22 71 560 240 800 14,385 7,398 Non-residential/Business Over quota Cell in landline frame / LL in Cell frame Duplicate number OF = Out of Frame 4,312 Not working 336 Computer/fax/modem 4,648 NWC = Not working/computer Voice mail Privacy Manager Other non-contact UONC = Non-contact, unknown eligibility O = Other (language) Child’s cell phone Other ineligible SO = Screen out (ineligible) R = Refusal, known eligible (breakoffs and qualified CBs) I = Completed interviews 21,783 T = Total numbers sampled 8 Table 3: Sample Disposition (continued…) RBS LL RBS CELL TOTAL 60.7% 85.6% 93.1% 71.8% 69.7% e1 = (I+R+SO+O+UOR+UONC)/(I+R+SO+O+UOR+UONC+OF+NWC) – Est. frame eligibility of non-contacts 85.5% e2 = (I+R)/(I+R+SO) – Est. screening eligibility of unscreened contacts 38.6% 17.8% 6.9% 35.3% 14.9% 5.3% CON = [I + R + (e2*[O + UOR])]/[I + R + (e2*[O + UOR + UONC]) + 37.0% (e1*e2*UHUONC)] 16.7% COOP = I/[I + R + (e2*[O + UOR])] 6.2% AAPOR RR3=I/[I+R+[e2*(UOR+UONC+O)]+[e1*e2*UHUONC]] = CON*COOP DELIVERABLES SSRS delivered to Vanderbilt University: • Final questionnaire instrument; • Weighted dataset in SPSS; • Weighted banners in PDF; and • A detailed methods report. ABOUT SSRS SSRS is a full-service market and survey research firm managed by a core of dedicated professionals with advanced degrees in the social sciences. Service offerings include the Omnibus Survey, Probability Panel and other Online Solutions as well as custom research programs – all driven by a central commitment to methodological rigor. The SSRS team is renowned for its multimodal approach, as well as its sophisticated and proprietary sample designs. Typical projects for the company include complex strategic, tactical and public opinion initiatives in the U.S. and in more than 40 countries worldwide. SSRS is research, refined. Visit www.ssrs.com for more information. 9 100 points MTH 1151 Fall 2020 Problem Set 1 1 Ground Rules: • You may discuss this problem set. • You may NOT ask someone else to work these problems for you. • You may ask for help on similar problems, but YOU must present the problems you want help on. Discussion: Candidates for The Senatorial and Gubernatorial Races You may NOT ask someone else to choose a problem similar to a problem set question to work as an example. Specifically, you may ask for help or clarification from your lecture notes or on your projects and homework, but you may not ask anyone besides Dr. Starnes for help on the actual problem set questions. • All work presented must be your own. Instructions: • Compile your work into a single Word document (.doc or .docx), google document, or PDF for submission on Blackboard. Including screen shots or pictures in your answer document is perfectly acceptable. • Answer each question below. Provide an answer to each question, do not only provide SPSS output. Remember that I need you to show me that you know where in the SPSS output the answer may be found. • You MUST show your work to receive full credit, which includes submitting the relevant SPSS output generated for these problems and/or any other supporting information or work. • Number each of your responses. If you type, please use a standard font (like Times New Roman or Arial) in size 11pt or 12pt. You may single space or double space your responses. If you handwrite, please be sure that your handwriting is legible. • Any justifications or explanations should answered in complete sentences. • Include your name and the problem set name (Problem Set 1) on the first page of your problem set. Rubric: Item 1a Points Available 16 1b 9 2 5 Notes Correct length = 2 points Include paper in summary = 3 points Include web page in summary = 3 points Correct summary = 3 points Include something learned/interesting = 3 points Readability = 2 points Correct length = 2 points Readability = 2 points Specific question = 3 points Context provided for question = 2 points 2a = 1 points 2b = 2 points 2c = 2 points 100 points MTH 1151 Fall 2020 Problem Set 1 3a, 3b 4 (2 each) 3c 2 4a, 4d 22 (1 point per descriptive statistic) 4b, 4e 2 (1 each) 4c, 4f 2 (1 each) 4g 3 4h 4 5 4 6a, 6b 6 (3 each) 7a, 7b, 7c, 7d, 7e 15 (3 each) Formatting 4 Standard font used TOTAL POINTS: 2 100 1 point = describe graph 1 point = describe appropriate data or provide example data 0/2 = no answer 1/2 = partially correct answer 2/2 = completely correct answer One point per descriptive statistic. Discussion: Candidates for The Senatorial and Gubernatorial Races Be sure to label the values in your 5 number summary. Descriptive statistics for recumbent and standing systolic BP: • Mean • Median • Mode • Standard deviation • Variance • 5 number summary • 88th percentile Interpret the 88th percentile for recumbent and standing systolic BP. boxplot of the standing diastolic blood pressure and recumbent systolic BP 1 point = paragraph is correct length 2 point = paragraph demonstrates clear comparison of recumbent and standing diastolic blood pressure 1 point = chose measure of central tendency 1 point = chose measure of spread 2 points = justify choices 2 points = A and B are mutually exclusive 2 points = example illustrates why P(A)+P(B)=P(A or B) 0/3 = no answer 1/3 = answer attempted 2/3 = partially correct answer 3/3 = completely correct answer 0/3 = no answer 1/3 = answer attempted 2/3 = partially correct answer 3/3 = completely correct answer Responses numbered/labeled Name included on first page Class meeting time included on f … Get a 10 % discount on an order above $ 100 Use the following coupon code : NURSING10

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