\chapter{Results}

%TODO some text here
This section shows the results of the experiments described in section 3 on the data sets described in section 4. In the following diagrams, the blue line states the average sentiment of the answers to questions from new contributors. This line also has numbers attached to it at every datapoint and shows the number of answers that formed the sentiment average. The orange line shows ITS analysis as a 3-segment line.


% pvalues ... 
% maybe average data points per month


%TODO write some text to each result
\section{StackOverflow.com}
\begin{figure}[H]
 \centering\includegraphics[scale=0.47]{../stackoverflow.com/output/its/average_sentiments-i1.png}
 \caption{An interrupted time series analysis of the sentiments of answer to questions created by new contributors on StackOverflow.com}
 \label{stackoverflow_its}
\end{figure}
StackOverflow shows a very slight decrease in average sentiment of time before the change had been introduced. When the change occured the average sentiment jumped up by about 0.003. After the change the sentiments reached higher levels and kept rising. 
% sentiment falling prior to change
% jump upward at the change
% sentiments rising after change

\section{math.stackexchange.com} 
The math.stackexchange.com community shows a decrease in average sentiments prior to the change. The sentiment make a small jump upward when the change is introduced, however, the sentiments decrease faster after the indroduction of the change compared to before the change.\begin{figure}[H]
 \centering\includegraphics[scale=0.47]{../math.stackexchange.com/output/its/average_sentiments-i1.png}
 \caption{An interrupted time series analysis of the sentiments of answer to questions created by new contributors on math.stackexchange.com}
 \label{math_its}
\end{figure}
% sentiments falling prior to the change
% sentiments falling faster than before the change

\section{MathOverflow.net}
MathOverflow shows a constant regresssion before the change, however, average sentiments are low at about 10 months before the change and spiked high directly before the change. When the change is introduced regression makes a small jumps up and decreases thereafter. This data set is sparse compared to the other datasets.
\begin{figure}[H]
 \centering\includegraphics[scale=0.47]{../mathoverflow.net/output/its/average_sentiments-i1.png}
 \caption{An interrupted time series analysis of the sentiments of answer to questions created by new contributors on MathOverflow.com}
 \label{matho_its}
\end{figure}
% senitments stable/constant prior to the change
% falling after the change

\section{AskUbuntu.com}
AskUbuntu saw a decrease in average sentiments prior to the change. After the introduction of the change the regression dipped but sentiments keep rising drastically since then.
\begin{figure}[H]
 \centering\includegraphics[scale=0.47]{../askubuntu.com/output/its/average_sentiments-i1.png}
 \caption{An interrupted time series analysis of the sentiments of answer to questions created by new contributors on AskUbuntu.com}
 \label{ubuntu_its}
\end{figure}
%senitments have gradually fallen prior to the change
% sentiments increased after the change
%maybe: sentiments did not change drastically as seen in maths communities

\section{ServerFault.com}
ServerFault shows gradually rising average sentiments prior to the change. At the time of the change the regession makes a jump upward and the average sentiment decrease slowly afterward.
\begin{figure}[H]
 \centering\includegraphics[scale=0.47]{../serverfault.com/output/its/average_sentiments-i1.png}
 \caption{An interrupted time series analysis of the sentiments of answer to questions created by new contributors on ServerFault.com}
 \label{fault_its}
\end{figure}
%sentiments fairly stable before and after the change
% small jump in avg sentiments at change date

\section{SuperUser.com}
SuperUser shows only sightly decreasing average sentiment up to the change. At the change time the regression takes a dip down and the regression shows a downward trend after the change. Indeed the average sentiments dipped considerably when the change is introducted the average sentiment recovers about 13 months later. Data available in the future will show if the recovery is persistent.
\begin{figure}[H]
 \centering\includegraphics[scale=0.47]{../superuser.com/output/its/average_sentiments-i1.png}
 \caption{An interrupted time series analysis of the sentiments of answer to questions created by new contributors on SuperUser.com}
 \label{super_its}
\end{figure}
%sentiments fairly stable until the change date
%after change sentiments took a samll dive 
% recovery after after 13 months to not quite the previous levels

\section{electronics.stackexchange.com}
On electronics.stackexchange.com the average sentiment decreases continuously prior to the change. At the change date the regression makes a little jump upward but the trend from before the change continues afterward. Similarly to SuperUser, the average sentiment recover at about 12 months after the change is introduced and future data will be necessary to determine if the recovery is persistent.s
\begin{figure}[H]
 \centering\includegraphics[scale=0.47]{../electronics.stackexchange.com/output/its/average_sentiments-i1.png}
 \caption{An interrupted time series analysis of the sentiments of answer to questions created by new contributors on electronics.stackexchange.com}
 \label{ele_its}
\end{figure}
%sentiments were falling continuously before and after the change
% recovery started after 12 month after the change
% more data in the future will be required to determine if upward trend in the end continues

\section{stats.stackexchange.com}
On stats.stackexchange.com the average sentiment is steadily decreasing prior to the change. The regression dips when the change is introduced. However, the average sentiment after the change indicate a slight upward trend.
\begin{figure}[H]
 \centering\includegraphics[scale=0.47]{../stats.stackexchange.com/output/its/average_sentiments-i1.png}
 \caption{An interrupted time series analysis of the sentiments of answer to questions created by new contributors on stats.stackexchange.com}
 \label{stats_its}
\end{figure}
% sentiments steadily decreasing prior to the change
% dip in avg sentiment at the change date
% sight upward trend after the change

\section{tex.stackexchange.com}
On tex.stackexchange.com the average sentiment is low comapred to the other investigated data sets. Prior to the change the average sentiment only slightly decreases. When the change is introduced the regreesion takes a dip down. After the change the analysis indicates a strong increase in average sentiment. Future data will be required to see if this upward trend continues or evens out.
\begin{figure}[H]
 \centering\includegraphics[scale=0.47]{../tex.stackexchange.com/output/its/average_sentiments-i1.png}
 \caption{An interrupted time series analysis of the sentiments of answer to questions created by new contributors on tex.stackexchange.com}
 \label{tex_its}
\end{figure}
%avg sentiment fairly low compared to the other investigated communities
% avg sentiment slowly decreasing prior to the change
% large dips in avg snetiment after the change
% trend after change strongly upward

\section{unix.stackexchange.com}
On unix.stackexchange.com the average sentiment is decreasing prior to the change. When the change is introduced the regreesion take a small dip down, however, the average sentiment increases fast after the change. 
\begin{figure}[H]
 \centering\includegraphics[scale=0.47]{../unix.stackexchange.com/output/its/average_sentiments-i1.png}
 \caption{An interrupted time series analysis of the sentiments of answer to questions created by new contributors on unix.stackexchange.com}
 \label{unix_its}
\end{figure}
%sentiments decreasing prior to the change
%snetiments rising after the change
% little jump upwards at change date



