Travel Decision Survey Data 2013

This workbook provides data and data dictionaries for the SFMTA 2013 Travel Decision Survey.
The 2013 Summary Report and Methodology, including the survey instrument, can be found online at https://www.sfmta.com/about-sfmta/reports/travel-decision-survey-2013.
Data, methodologies, and summary report for other SFMTA travel decision surveys is available on sfmta.com.
On behalf of San Francisco Municipal Transportation Agency (SFMTA), Corey, Canapary & Galanis (CC&G) undertook a Mode Share Survey within the City and County of San Francisco as well as the eight surrounding Bay Area counties of Alameda, Contra Costa, San Mateo, Marin, Santa Clara, Napa, Sonoma and Solano.

The primary goals of this study were to:
• Assess percent mode share for travel in San Francisco for evaluation of the SFMTA Strategic Objective 2.3: Mode Share target of 50% non-private auto travel by FY2018 with a 95% confidence level and MOE +/- 5% or less.
• Evaluate the above statement based on the following parameters: number of trips to, from, and within San Francisco by Bay Area residents. Trips by visitors to the Bay Area and for commercial purposes are not included.
• Provide additional trip details, including trip purpose for each trip in the mode share question series.
• Collect demographic data on the population of Bay Area residents who travel to, from, and within San Francisco.
• Collect data on travel behavior and opinions that support other SFMTA strategy and project evaluation needs.

The survey was conducted as a telephone study among with approximately 750 Bay Area residents aged 18 and older. Interviewing was conducted in English, Spanish, and Cantonese. Surveying was conducted via random digit dial (RDD) and cell phone sample.
All three survey datasets incorporate respondent weighting based on age and home location; utilize the “weight” field when appropriate in your analysis.

The survey period for this survey is as follows:
2013: April 2014 – May 2014 (survey name of 2013 reflects the originally planned start date of Fall 2013)

The margin of error is related to sample size (n). For the total sample, the margin of error is 3.5% for a confidence level of 95%. When looking at subsets of the data, such as just the SF population, just the female population, or just the population of people who bicycle, the sample size decreases and the margin of error increases. Below is a guide of the margin of error for different samples sizes. Be cautious in making conclusions based off of small sample sizes.

At the 95% confidence level is:
• n = 767 (Total Sample). Margin of error = +/- 3.5%
• n = 384. Margin of error = +/- 4.95%
• n = 100. Margin of error = +/- 9.80%

本工作簿提供了 SFMTA 2013 年出行决策调查的数据及数据字典。2013 年的总结报告和方法论，包括调查工具，可在 https://www.sfmta.com/about-sfmta/reports/travel-decision-survey-2013 网站上找到。其他 SFMTA 出行决策调查的数据、方法论和总结报告可在 sfmta.com 网站上查阅。受旧金山市政交通局（SFMTA）委托，Corey, Canapary & Galanis（CC&G）在旧金山市和县以及八个周边湾区县（阿拉米达、康特拉科斯塔、圣马特奥、马里恩、圣克拉拉、纳帕、索诺马和索拉诺）进行了模式份额调查。本研究的首要目标是：
• 评估旧金山市出行模式份额，以评估 SFMTA 战略目标 2.3：到财年 2018 年，非私家车出行模式份额达到 50%，置信度为 95%，误差范围 ±5% 或更小。
• 基于以下参数评估上述陈述：湾区居民前往、离开和位于旧金山市的出行次数。不包括访问湾区和商业目的的游客出行。
• 提供额外的出行详细信息，包括模式份额问题系列中每趟出行的出行目的。
• 收集有关在旧金山市出行、离开和位于湾区居民的人口统计数据。
• 收集支持其他 SFMTA 战略和项目评估需求出行行为和意见的数据。
调查以电话调查的形式进行，调查对象约为 750 名 18 岁及以上的湾区居民。访谈以英语、西班牙语和广东话进行。调查采用随机数字拨号（RDD）和移动电话样本进行。
所有三个调查数据集均根据年龄和居住地进行了受访者加权；在分析时，适当使用“权重”字段。
本调查的调查期如下：2013 年：2014 年 4 月至 2014 年 5 月（2013 年的调查名称反映了原计划于 2013 年秋季开始的时间）。
误差范围与样本大小（n）有关。对于总体样本，误差范围为 95% 置信度下的 ±3.5%。当查看数据子集时，例如仅针对 SF 人口、仅针对女性人口或仅针对骑自行车的人口，样本量会减少，误差范围会增加。以下是不同样本大小误差范围的指南。在基于小样本量得出结论时要谨慎。
在 95% 的置信水平下：
• n = 767（总体样本）。误差范围 = ±3.5%
• n = 384。误差范围 = ±4.95%
• n = 100。误差范围 = ±9.80%