PollstR Usage

Jeffrey Arnold

This document provides a few examples that use the pollstR package.

library("pollstR")
library("tidyverse")
## Loading tidyverse: ggplot2
## Loading tidyverse: tibble
## Loading tidyverse: tidyr
## Loading tidyverse: readr
## Loading tidyverse: purrr
## Loading tidyverse: dplyr
## Conflicts with tidy packages ----------------------------------------------
## filter(): dplyr, stats
## lag():    dplyr, stats

Produce a Plot of Chart

The pollstR package can be used to reproduce plots in the charts. This will use the Donald Trump favorable rating as the example. This chart has the slug donald-trump-favorable-rating

slug <- "donald-trump-favorable-rating"
polls <- pollster_charts_polls(slug)[["content"]]
trendlines <- pollster_charts_trendlines(slug)[["content"]]

Plot the points for each response (Favorable, Unfavorable, and Undecided) and fit a loess smoother through them:

.data <- gather(polls, response, value,
                Favorable, Unfavorable, Undecided) %>%
  mutate(value = if_else(is.na(value), 0, value))
ggplot() +
  geom_point(data = .data,
             aes(x = end_date, y = value, color = response),
             alpha = 0.5) +
  geom_smooth(data = .data, method = "loess", se = FALSE,
              aes(x = end_date, y = value, color = response))

Plot the points with the Pollster trendlines:

ggplot() +
  geom_point(data = .data,
             mapping = aes(x = end_date, y = value, color = response),
             alpha = 0.5) +
  geom_line(data = trendlines,
            mapping = aes(x = date, y = value, color = label), size = 1.5)

For each of the subpopulations (Likely Voter, Registered Voters, Adults), plot the favorability rating:

ggplot(data = filter(.data, response == "Favorable"),
       mapping = aes(x = end_date, y = value, color = sample_subpopulation)) +
  geom_point(alpha = 0.5) +
  geom_smooth(method = "loess", se = FALSE)

Questions

An example of a single question item:

questions <- pollster_questions()
questions$content$items[[1]]
## $slug
## [1] "17-VA-Gov-GE-RvP"
## 
## $name
## [1] "2017 Virginia Gubernatorial GE"
## 
## $tags
## list()
## 
## $charts
## list()
## 
## $election_date
## NULL
## 
## $n_polls
## [1] 1
## 
## $created_at
## [1] "2017-02-16T18:23:56.000Z"
## 
## $responses
## $responses[[1]]
## $responses[[1]]$label
## [1] "Riggleman"
## 
## $responses[[1]]$name
## [1] "Denver Riggleman"
## 
## $responses[[1]]$party
## [1] "Republican"
## 
## $responses[[1]]$incumbent
## [1] FALSE
## 
## 
## $responses[[2]]
## $responses[[2]]$label
## [1] "Perriello"
## 
## $responses[[2]]$name
## [1] "Tom Perriello"
## 
## $responses[[2]]$party
## [1] "Democrat"
## 
## $responses[[2]]$incumbent
## [1] FALSE
## 
## 
## $responses[[3]]
## $responses[[3]]$label
## [1] "Other"
## 
## $responses[[3]]$name
## [1] "Other"
## 
## $responses[[3]]$party
## NULL
## 
## $responses[[3]]$incumbent
## [1] FALSE
## 
## 
## $responses[[4]]
## $responses[[4]]$label
## [1] "Undecided"
## 
## $responses[[4]]$name
## [1] "Undecided"
## 
## $responses[[4]]$party
## NULL
## 
## $responses[[4]]$incumbent
## [1] FALSE

Charts

An example of a single chart item:

charts <- pollster_charts()
charts$content$items[[1]]
## $slug
## [1] "trump-job-approval"
## 
## $title
## [1] "Trump Job Approval"
## 
## $url
## [1] "http://elections.huffingtonpost.com/pollster/trump-job-approval"
## 
## $created_at
## [1] "2017-02-17T20:12:19.000Z"
## 
## $tags
## list()
## 
## $pollster_estimates
## $pollster_estimates[[1]]
## $pollster_estimates[[1]]$algorithm
## [1] "lowess"
## 
## $pollster_estimates[[1]]$created_at
## [1] "2017-02-20T05:00:34.222Z"
## 
## $pollster_estimates[[1]]$datetime
## [1] "2017-02-17T20:12:19.000Z"
## 
## $pollster_estimates[[1]]$values
## $pollster_estimates[[1]]$values$item_name
## [1] "value"
## 
## $pollster_estimates[[1]]$values$key_name
## [1] "label"
## 
## $pollster_estimates[[1]]$values$hash
## $pollster_estimates[[1]]$values$hash$Approve
## [1] 44.6073
## 
## $pollster_estimates[[1]]$values$hash$Disapprove
## [1] 50.5299
## 
## $pollster_estimates[[1]]$values$hash$Undecided
## [1] 5.4944
## 
## 
## 
## $pollster_estimates[[1]]$lowess_parameters
## $pollster_estimates[[1]]$lowess_parameters$f
## [1] 0.7
## 
## $pollster_estimates[[1]]$lowess_parameters$iter
## [1] 3
## 
## $pollster_estimates[[1]]$lowess_parameters$delta
## [1] 0.01
## 
## 
## 
## 
## $pollster_estimate_summary
## NULL
## 
## $question
## $question$slug
## [1] "00c -Pres-45-Trump - Job Approval - National"
## 
## $question$name
## [1] "Trump, Donald - USPres - Job Approval"
## 
## $question$tags
## list()
## 
## $question$charts
## $question$charts[[1]]
## [1] "trump-job-approval"
## 
## 
## $question$election_date
## NULL
## 
## $question$n_polls
## [1] 69
## 
## $question$created_at
## [1] "2017-01-10T18:32:55.000Z"
## 
## $question$responses
## $question$responses[[1]]
## $question$responses[[1]]$label
## [1] "Approve"
## 
## $question$responses[[1]]$name
## [1] "Approve"
## 
## $question$responses[[1]]$party
## NULL
## 
## $question$responses[[1]]$incumbent
## [1] FALSE
## 
## 
## $question$responses[[2]]
## $question$responses[[2]]$label
## [1] "Disapprove"
## 
## $question$responses[[2]]$name
## [1] "Disapprove"
## 
## $question$responses[[2]]$party
## NULL
## 
## $question$responses[[2]]$incumbent
## [1] FALSE
## 
## 
## $question$responses[[3]]
## $question$responses[[3]]$label
## [1] "Undecided"
## 
## $question$responses[[3]]$name
## [1] "Undecided"
## 
## $question$responses[[3]]$party
## NULL
## 
## $question$responses[[3]]$incumbent
## [1] FALSE

Polls

An example of a single poll item:

polls <- pollster_polls()
polls$content$items[[1]]
## $slug
## [1] "gallup-27126"
## 
## $start_date
## [1] "2017-02-14"
## 
## $end_date
## [1] "2017-02-16"
## 
## $created_at
## [1] "2017-02-17T23:54:51.000Z"
## 
## $updated_at
## [1] "2017-02-17T18:54:51.000Z"
## 
## $survey_house
## [1] "Gallup"
## 
## $mode
## [1] "Live Phone"
## 
## $url
## [1] "http://www.gallup.com/poll/201617/gallup-daily-trump-job-approval.aspx"
## 
## $partisanship
## [1] "Nonpartisan"
## 
## $partisan_affiliation
## [1] "None"
## 
## $poll_questions
## $poll_questions[[1]]
## $poll_questions[[1]]$text
## [1] ""
## 
## $poll_questions[[1]]$question
## $poll_questions[[1]]$question$slug
## [1] "00c -Pres-45-Trump - Job Approval - National"
## 
## $poll_questions[[1]]$question$name
## [1] "Trump, Donald - USPres - Job Approval"
## 
## $poll_questions[[1]]$question$tags
## list()
## 
## $poll_questions[[1]]$question$charts
## $poll_questions[[1]]$question$charts[[1]]
## [1] "trump-job-approval"
## 
## 
## $poll_questions[[1]]$question$election_date
## NULL
## 
## $poll_questions[[1]]$question$n_polls
## [1] 69
## 
## $poll_questions[[1]]$question$created_at
## [1] "2017-01-10T18:32:55.000Z"
## 
## $poll_questions[[1]]$question$responses
## $poll_questions[[1]]$question$responses[[1]]
## $poll_questions[[1]]$question$responses[[1]]$label
## [1] "Approve"
## 
## $poll_questions[[1]]$question$responses[[1]]$name
## [1] "Approve"
## 
## $poll_questions[[1]]$question$responses[[1]]$party
## NULL
## 
## $poll_questions[[1]]$question$responses[[1]]$incumbent
## [1] FALSE
## 
## 
## $poll_questions[[1]]$question$responses[[2]]
## $poll_questions[[1]]$question$responses[[2]]$label
## [1] "Disapprove"
## 
## $poll_questions[[1]]$question$responses[[2]]$name
## [1] "Disapprove"
## 
## $poll_questions[[1]]$question$responses[[2]]$party
## NULL
## 
## $poll_questions[[1]]$question$responses[[2]]$incumbent
## [1] FALSE
## 
## 
## $poll_questions[[1]]$question$responses[[3]]
## $poll_questions[[1]]$question$responses[[3]]$label
## [1] "Undecided"
## 
## $poll_questions[[1]]$question$responses[[3]]$name
## [1] "Undecided"
## 
## $poll_questions[[1]]$question$responses[[3]]$party
## NULL
## 
## $poll_questions[[1]]$question$responses[[3]]$incumbent
## [1] FALSE
## 
## 
## 
## 
## $poll_questions[[1]]$sample_subpopulations
## $poll_questions[[1]]$sample_subpopulations[[1]]
## $poll_questions[[1]]$sample_subpopulations[[1]]$name
## [1] "Adults"
## 
## $poll_questions[[1]]$sample_subpopulations[[1]]$observations
## [1] 1500
## 
## $poll_questions[[1]]$sample_subpopulations[[1]]$margin_of_error
## [1] 3
## 
## $poll_questions[[1]]$sample_subpopulations[[1]]$responses
## $poll_questions[[1]]$sample_subpopulations[[1]]$responses[[1]]
## $poll_questions[[1]]$sample_subpopulations[[1]]$responses[[1]]$text
## [1] "Approve"
## 
## $poll_questions[[1]]$sample_subpopulations[[1]]$responses[[1]]$pollster_label
## [1] "Approve"
## 
## $poll_questions[[1]]$sample_subpopulations[[1]]$responses[[1]]$value
## [1] 38
## 
## 
## $poll_questions[[1]]$sample_subpopulations[[1]]$responses[[2]]
## $poll_questions[[1]]$sample_subpopulations[[1]]$responses[[2]]$text
## [1] "Disapprove"
## 
## $poll_questions[[1]]$sample_subpopulations[[1]]$responses[[2]]$pollster_label
## [1] "Disapprove"
## 
## $poll_questions[[1]]$sample_subpopulations[[1]]$responses[[2]]$value
## [1] 56

Tags

Get all available tags for use as the tag parameter with charts, polls, and questions:

map_chr(pollster_tags()$content, "slug")
##  [1] "2012-president-gop-primary" "2012-president"            
##  [3] "favorable-ratings"          "obama-job-approval"        
##  [5] "2012-senate"                "2012-house"                
##  [7] "2012-governor"              "2012-governor-dem-primary" 
##  [9] "2012-senate-dem-primary"    "2012-senate-gop-primary"   
## [11] "2012-governor-gop-primary"  "2014-house"                
## [13] "2013-governor"              "2013-senate"               
## [15] "2014-senate"                "2013-senate-dem-primary"   
## [17] "2014-governor"              "2016-president-gop-primary"
## [19] "2013-house"                 "2016-president-dem-primary"
## [21] "2013-senate-gop-primary"    "2016-president"            
## [23] "2014-senate-gop-primary"    "2014-senate-dem-primary"   
## [25] "2014-governor-dem-primary"  "2014-senate-primary"       
## [27] "2014-governor-gop-primary"  "2016-senate"               
## [29] "2016-governor"              "2016-senate-dem-primary"   
## [31] "2016-senate-gop-primary"    "2016-house"                
## [33] "uk-eu-referendum"           "2016-governor-dem-primary" 
## [35] "2016-governor-gop-primary"