"How can people possibly measure happiness?" I once thought, and I believe many people would ask the same. With the technology we have today, it is very easy to measure time, length, mass, temperature, etc. We have standardized units for them, and they can be objectively measured using tools. But happiness is a subjective property, and we do not have a "hedonimeter"/"happinometer" to measure our happiness. We do not even have a widely accepted definition of "happiness" in the scientific/academic community. So how is that possible? But it is possible, at least for many psychologists and other social scientists.
The Life Satisfaction Survey Approach
Many researchers are interested in studying what makes people feel happy or how satisfied they are with their lives. The most common approach they use to collect data from the population is to ask them directly. They ask people to rate their lives. Within this approach, one of the widely used scales is the "Cantril ladder" (or "Cantril Scale"). The question is asked as follows:
Please imagine a ladder with steps numbered from zero at the bottom to 10 at the top. The top of the ladder represents the best possible life for you and the bottom of the ladder represents the worst possible life for you. On which step of the ladder would you say you personally feel you stand at this time? (source: Gallup)
It could also be something similar but instead a 5-point scale or a 7-point scale. The point is to get people to recall their memories and judge how happy their lives are. This life satisfaction measurement, is often seen as an equivalent for the measurement of "happiness"/"well-being".
The Daily Emotions Record Approaches
Instead of asking people to make a judgement about their whole lives, another way to measure happiness is to collect the daily emotions (affects) of people. This could be using a mobile device or an app on the phone that would remind them to record their feelings/emotions every once a while throughout the day (known as "the Experience Sampling Method"); or, asking them to recall the events throughout the day and the feelings/emotions attached to them at the end of the day/the next day, similar to writing a diary (known as"the Day Reconstruction Method"). Researchers sometimes use these methods to collect people's daily feelings/emotions to see what activities contribute to the decrease/increase of emotional well-being, and also the frequency or the duration of those positive/negative states.
Scanning the Brain
A very different approach from the above is brain scanning (fMRI or PET). Scientists can use it to detect which brain region is associated with a certain emotion and sometimes the intensity of the emotion, but it has very little power to detect how "happy"/joyful/pleasant, etc. people are at that moment. And of course neither is it capable of telling how content/satisfied people are with their lives. Plus it is costly so it cannot be used on a big group of people.
Overall, the most widely used approach is to just ask individuals how they feel about their lives as a whole. One of the reasons why we know it works is just that we do see certain substantial patterns. Richer people and healthier people tend to be happier, the unemployed and socially isolated people tend to be less happy, etc.
Limitations
But how reliable is this approach? When I casually asked my friend the Cantril ladder question, my friend gave a 10 (which is very rare in the population). I let her explain and she told me, "Well I feel like I have everything already, and I have never had any big accident in my life, although it would be better if [...]" Then I immediately said, "It wouldn't be a 10 then if there is space to improve, would it?" She said, "then maybe 9?"
We should not be surprised to see this kind of error in the data. If this kind of error is distributed randomly and consistently in the sample, then it is not a problem. But are there cognitive biases that would distort the data? For example, would unhappy people tend to exaggerate how unhappy they are? This would not be surprising because we do know that human beings are naturally more sensitive towards the negative. In that case, a "4" would not really mean the half of 8.
According to the well-known psychologist Daniel Kahneman, the experiencing self is different from the remembering self (Kahneman, 2011, p. 377). How you remember things is different from how you experience them. The life satisfaction approach merely collects the memory data. Maybe you have had a much worse/better life (based on the experience self standard) and you just do not remember it.
In addition, "happiness"/satisfaction with life could be understood slightly differently in different cultures, and the meaning could be lost in the translation. How do we know we are measuring the same thing across all cultures?
So far, despite some of its limitations, this survey approach is probably the best we have today if we want to see collect happiness data from the population. We do have ways to measure one sense of happiness in a somewhat reliable way. The next question is: how should we utilize it? Should our governments start measuring the happiness of the citizens, like Bhutan? Stay tuned.
Reference:
Kahneman, D. (2011). Thinking Fast, and Slow. New York, New York: Farrar, Straus and Giroux.
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